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Ray Optics and Optical Instruments EXERCISES Solutions
- Q9.1: A small candle, 2.5 cm in size is placed at 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Describe the nature and size of the image. If the candle is moved closer to the mirror, how would the screen have to be moved?
- Q9.1: A small candle, ((2.5)) cm in size is placed at ((27)) cm in front of a concave mirror of radius of curvature ((36)) cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Describe the nature and size of the image. If the candle is moved closer to the mirror, how would the screen have to be moved?
- Q9.10: What is the focal length of a convex lens of focal length ((30))cm in contact with a concave lens of focal length ((20))cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.
- Q9.10: What is the focal length of a convex lens of focal length 30cm in contact with a concave lens of focal length 20cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.
- Q9.11(a): A compound microscope consists of an objective lens of focal length ((2.0)) cm and an eyepiece of focal length ((6.25)) cm separated by a distance of ((15))cm. How far from the objective should an object be placed in order to obtain the final image at the least distance of distinct vision (((25))cm)? What is the magnifying power of the microscope in each case?
- Q9.11(a): A compound microscope consists of an objective lens of focal length 2.0 cm and an eyepiece of focal length 6.25 cm separated by a distance of 15cm. How far from the objective should an object be placed in order to obtain the final image at (a) the least distance of distinct vision (25cm)?
- Q9.11(b): A compound microscope consists of an objective lens of focal length ((2.0)) cm and an eyepiece of focal length ((6.25)) cm separated by a distance of ((15))cm. How far from the objective should an object be placed in order to obtain the final image at infinity? What is the magnifying power of the microscope in each case?
- Q9.11(b): A compound microscope consists of an objective lens of focal length 2.0 cm and an eyepiece of focal length 6.25 cm separated by a distance of 15cm. How far from the objective should an object be placed in order to obtain the final image at (b) at infinity? What is the magnifying power of the microscope in each case?
- Q9.12: A person with a normal near point (((25)) cm) using a compound microscope with objective of focal length ((8.0)) mm and an eyepiece of focal length ((2.5))cm can bring an object placed at ((9.0))mm from the objective in sharp focus. What is the separation between the two lenses? Calculate the magnifying power of the microscope,
- Q9.12: A person with a normal near point (25 cm) using a compound microscope with objective of focal length 8.0 mm and an eyepiece of focal length 2.5cm can bring an object placed at 9.0mm from the objective in sharp focus. What is the separation between the two lenses? Calculate the magnifying power of the microscope,
- Q9.13: A small telescope has an objective lens of focal length ((144))cm and an eyepiece of focal length ((6.0))cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece?
- Q9.13: A small telescope has an objective lens of focal length 144cm and an eyepiece of focal length 6.0cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece?
- Q9.14(a): A giant refracting telescope at an observatory has an objective lens of focal length ((15))m. If an eyepiece of focal length ((1.0))cm is used, what is the angular magnification of the telescope?
- Q9.14(a): A giant refracting telescope at an observatory has an objective lens of focal length 15m. If an eyepiece of focal length 1.0cm is used, what is the angular magnification of the telescope?
- Q9.14(b): If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is ((3.48 \times 10^{6}))m, and the radius of lunar orbit is ((3.8 \times 10^{8}))m.
- Q9.14(b): If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is $3.48 \times 10^6$m, and the radius of lunar orbit is $3.8 \times 10^8$m.
- Q9.15(a): Use the mirror equation to deduce that: an object placed between ((f)) and ((2f)) of a concave mirror produces a real image beyond ((2f)).
- Q9.15(a): Use the mirror equation to deduce that: (a) an object placed between $f$ and $2f$ of a concave mirror produces a real image beyond $2f$.
- Q9.15(b): Use the mirror equation to deduce that: (b) a convex mirror always produces a virtual image independent of the location of the object.
- Q9.15(b): Use the mirror equation to deduce that: a convex mirror always produces a virtual image independent of the location of the object.
- Q9.15(c): Use the mirror equation to deduce that: (c) the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the pole.
- Q9.15(c): Use the mirror equation to deduce that: the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the pole.
- Q9.15(d): Use the mirror equation to deduce that: (d) an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.
- Q9.15(d): Use the mirror equation to deduce that: an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image. [Note: This exercise helps you deduce algebraically properties of images that one obtains from explicit ray diagrams.]
- Q9.16: A small pin fixed on a table top is viewed from above from a distance of 50cm. By what distance would the pin appear to be raised if it is viewed from the same point through a 15cm thick glass slab held parallel to the table? Refractive index of glass = 1.5. Does the answer depend on the location of the slab?
- Q9.16: A small pin fixed on a table top is viewed from above from a distance of ((50))cm. By what distance would the pin appear to be raised if it is viewed from the same point through a ((15))cm thick glass slab held parallel to the table? Refractive index of glass = ((1.5)). Does the answer depend on the location of the slab?
- Q9.17(a): Figure 9.28 shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index ((1.68)). The outer covering of the pipe is made of a material of refractive index ((1.44)). What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure.
- Q9.17(a): Figure 9.28 shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure.
- Q9.17(b): What is the answer if there is no outer covering of the pipe?
- Q9.17(b): What is the answer if there is no outer covering of the pipe?
- Q9.18: The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose?
- Q9.18: The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall ((3))m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose?
- Q9.19: A screen is placed 90cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20cm. Determine the focal length of the lens.
- Q9.19: A screen is placed ((90))cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by ((20))cm. Determine the focal length of the lens.
- Q9.2: A ((4.5)) cm needle is placed ((12)) cm away from a convex mirror of focal length ((15)) cm. Give the location of the image and the magnification. Describe what happens as the needle is moved farther from the mirror.
- Q9.2: A 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. Give the location of the image and the magnification. Describe what happens as the needle is moved farther from the mirror.
- Q9.20(a): Determine the ‘effective focal length’ of the combination of the two lenses in Exercise 9.10, if they are placed 8.0cm apart with their principal axes coincident. Does the answer depend on which side of the combination a beam of parallel light is incident? Is the notion of effective focal length of this system useful at all?
- Q9.20(a): A convex lens of focal length ((30))cm is placed ((8.0))cm apart from a concave lens of focal length ((20))cm with their principal axes coincident. Determine the ‘effective focal length’ of this combination. Does the answer depend on which side of the combination a beam of parallel light is incident? Is the notion of effective focal length of this system useful at all?
- Q9.20(b): An object 1.5 cm in size is placed on the side of the convex lens in the arrangement (a) above. The distance between the object and the convex lens is 40 cm. Determine the magnification produced by the two-lens system, and the size of the image.
- Q9.20(b): An object ((1.5)) cm in size is placed on the side of the convex lens in the arrangement (a) above. The distance between the object and the convex lens is ((40)) cm. Determine the magnification produced by the two-lens system, and the size of the image.
- Q9.21: At what angle should a ray of light be incident on the face of a prism of refracting angle 60° so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is 1.524.
- Q9.21: At what angle should a ray of light be incident on the face of a prism of refracting angle ((60^{\circ})) so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is ((1.524)).
- Q9.22(a): A card sheet divided into squares each of size ((1 \text{ mm}^{2})) is being viewed at a distance of ((9)) cm through a magnifying glass (a converging lens of focal length ((9)) cm) held close to the eye. What is the magnification produced by the lens? How much is the area of each square in the virtual image?
- Q9.22(a): A card sheet divided into squares each of size 1 $mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 9 cm) held close to the eye. (a) What is the magnification produced by the lens? How much is the area of each square in the virtual image?
- Q9.22(b): A card sheet divided into squares each of size 1 $mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 9 cm) held close to the eye. (b) What is the angular magnification (magnifying power) of the lens?
- Q9.22(b): A card sheet divided into squares each of size ((1 \text{ mm}^{2})) is being viewed at a distance of ((9)) cm through a magnifying glass (a converging lens of focal length ((9)) cm) held close to the eye. What is the angular magnification (magnifying power) of the lens?
- Q9.22(c): A card sheet divided into squares each of size 1 $mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 9 cm) held close to the eye. (c) Is the magnification in (a) equal to the magnifying power in (b)? Explain.
- Q9.22(c): A card sheet divided into squares each of size ((1 \text{ mm}^{2})) is being viewed at a distance of ((9)) cm through a magnifying glass (a converging lens of focal length ((9)) cm) held close to the eye. Is the magnification in (a) equal to the magnifying power in (b)? Explain.
- Q9.23(a): At what distance should the lens be held from the card sheet in Exercise 9.22 in order to view the squares distinctly with the maximum possible magnifying power?
- Q9.23(a): In order to view a card sheet with squares of size ((1 \text{ mm}^{2})) with the maximum possible magnifying power using a converging lens of focal length ((9)) cm, at what distance should the lens be held from the card sheet?
- Q9.23(b): What is the magnification in this case?
- Q9.23(b): What is the magnification in this case?
- Q9.23(c): Is the magnification equal to the magnifying power in this case? Explain.
- Q9.23(c): Is the magnification equal to the magnifying power in this case? Explain.
- Q9.24: Using a magnifying glass with a focal length of ((9))cm, what should be the distance between the magnifying glass and an object with squares on it, if the virtual image of each square is to have an area of ((6.25 \text{ mm}^{2})). Would you be able to see the squares distinctly with your eyes very close to the magnifier? [Note: This exercise helps you clearly understand the difference between magnification in absolute size and the angular magnification (or magnifying power) of an instrument.]
- Q9.24: What should be the distance between the object and the magnifying glass if the virtual image of each square in the figure is to have an area of 6.25 $mm^2$. Would you be able to see the squares distinctly with your eyes very close to the magnifier?
- Q9.25(a): Answer the following questions: The angle subtended at the eye by an object is equal to the angle subtended at the eye by the virtual image produced by a magnifying glass. In what sense then does a magnifying glass provide angular magnification?
- Q9.25(a): Answer the following questions: (a) The angle subtended at the eye by an object is equal to the angle subtended at the eye by the virtual image produced by a magnifying glass. In what sense then does a magnifying glass provide angular magnification?
- Q9.25(b): Answer the following questions: In viewing through a magnifying glass, one usually positions one’s eyes very close to the lens. Does angular magnification change if the eye is moved back?
- Q9.25(b): Answer the following questions: (b) In viewing through a magnifying glass, one usually positions one’s eyes very close to the lens. Does angular magnification change if the eye is moved back?
- Q9.25(c): Answer the following questions: Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power?
- Q9.25(c): Answer the following questions: (c) Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power?
- Q9.25(d): Answer the following questions: (d) Why must both the objective and the eyepiece of a compound microscope have short focal lengths?
- Q9.25(d): Answer the following questions: Why must both the objective and the eyepiece of a compound microscope have short focal lengths?
- Q9.25(e): Answer the following questions: When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it for best viewing. Why? How much should be that short distance between the eye and eyepiece?
- Q9.25(e): Answer the following questions: (e) When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it for best viewing. Why? How much should be that short distance between the eye and eyepiece?
- Q9.26: An angular magnification (magnifying power) of 30X is desired using an objective of focal length 1.25cm and an eyepiece of focal length 5cm. How will you set up the compound microscope?
- Q9.26: An angular magnification (magnifying power) of ((30))X is desired using an objective of focal length ((1.25))cm and an eyepiece of focal length ((5))cm. How will you set up the compound microscope?
- Q9.27(a): A small telescope has an objective lens of focal length 140cm and an eyepiece of focal length 5.0cm. What is the magnifying power of the telescope for viewing distant objects when (a) the telescope is in normal adjustment (i.e., when the final image is at infinity)?
- Q9.27(a): A small telescope has an objective lens of focal length ((140))cm and an eyepiece of focal length ((5.0))cm. What is the magnifying power of the telescope for viewing distant objects when the telescope is in normal adjustment (i.e., when the final image is at infinity)?
- Q9.27(b): A small telescope has an objective lens of focal length ((140))cm and an eyepiece of focal length ((5.0))cm. What is the magnifying power of the telescope for viewing distant objects when the final image is formed at the least distance of distinct vision (((25))cm)?
- Q9.27(b): A small telescope has an objective lens of focal length 140cm and an eyepiece of focal length 5.0cm. What is the magnifying power of the telescope for viewing distant objects when (b) the final image is formed at the least distance of distinct vision (25cm)?
- Q9.28(a): For the telescope described in Exercise 9.27 (a), what is the separation between the objective lens and the eyepiece?
- Q9.28(a): For a telescope with an objective lens of focal length ((140))cm and an eyepiece of focal length ((5.0))cm in normal adjustment, what is the separation between the objective lens and the eyepiece?
- Q9.28(b): If this telescope is used to view a 100 m tall tower 3 km away, what is the height of the image of the tower formed by the objective lens?
- Q9.28(b): If a telescope with an objective lens of focal length ((140))cm is used to view a ((100)) m tall tower ((3)) km away, what is the height of the image of the tower formed by the objective lens?
- Q9.28(c): What is the height of the final image of the tower if it is formed at 25cm?
- Q9.28(c): For a telescope with an objective lens of focal length ((140))cm and an eyepiece of focal length ((5.0))cm, what is the height of the final image of a ((100)) m tall tower ((3)) km away if the image is formed at ((25))cm?
- Q9.29: A Cassegrain telescope uses two mirrors as shown in Fig. 9.26. Such a telescope is built with the mirrors 20mm apart. If the radius of curvature of the large mirror is 220mm and the small mirror is 140mm, where will the final image of an object at infinity be?
- Q9.29: A Cassegrain telescope uses two mirrors. Such a telescope is built with the mirrors ((20))mm apart. If the radius of curvature of the large mirror is ((220))mm and the small mirror is ((140))mm, where will the final image of an object at infinity be?
- Q9.3: A tank is filled with water to a height of 12.5 cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be 9.4 cm. What is the refractive index of water? If water is replaced by a liquid of refractive index 1.63 up to the same height, by what distance would the microscope have to be moved to focus on the needle again?
- Q9.3: A tank is filled with water to a height of ((12.5)) cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be ((9.4)) cm. What is the refractive index of water? If water is replaced by a liquid of refractive index ((1.63)) up to the same height, by what distance would the microscope have to be moved to focus on the needle again?
- Q9.30: Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. 9.29. A current in the coil produces a deflection of $3.5^{\circ}$ of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away?
- Q9.30: Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. 9.29. A current in the coil produces a deflection of ((3.5^{\circ})) of the mirror. What is the displacement of the reflected spot of light on a screen placed ((1.5)) m away?
- Q9.31: Figure 9.30 shows an equiconvex lens (of refractive index 1.50) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle. The distance of the needle from the lens is measured to be 45.0cm. The liquid is removed and the experiment is repeated. The new distance is measured to be 30.0cm. What is the refractive index of the liquid?
- Q9.31: Figure 9.30 shows an equiconvex lens (of refractive index ((1.50))) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle. The distance of the needle from the lens is measured to be ((45.0))cm. The liquid is removed and the experiment is repeated. The new distance is measured to be ((30.0))cm. What is the refractive index of the liquid?
- Q9.4: Figures 9.27(a) and (b) show refraction of a ray in air incident at ((60^{\circ})) with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in glass when the angle of incidence in water is ((45^{\circ})) with the normal to a water-glass interface [Fig. 9.27(c)].
- Q9.4: Figures 9.27(a) and (b) show refraction of a ray in air incident at 60° with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in glass when the angle of incidence in water is 45° with the normal to a water-glass interface [Fig. 9.27(c)].
- Q9.5: A small bulb is placed at the bottom of a tank containing water to a depth of ((80))cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is ((1.33)). (Consider the bulb to be a point source.)
- Q9.5: A small bulb is placed at the bottom of a tank containing water to a depth of 80cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. (Consider the bulb to be a point source.)
- Q9.6: A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. The angle of minimum deviation is measured to be ((40^{\circ})). What is the refractive index of the material of the prism? The refracting angle of the prism is ((60^{\circ})). If the prism is placed in water (refractive index ((1.33))), predict the new angle of minimum deviation of a parallel beam of light.
- Q9.6: A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. The angle of minimum deviation is measured to be 40°. What is the refractive index of the material of the prism? The refracting angle of the prism is 60°. If the prism is placed in water (refractive index 1.33), predict the new angle of minimum deviation of a parallel beam of light.
- Q9.7: Double-convex lenses are to be manufactured from a glass of refractive index ((1.55)), with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be ((20))cm?
- Q9.7: Double-convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be 20cm?
- Q9.8(a): A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam ((12))cm from P. At what point does the beam converge if the lens is a convex lens of focal length ((20))cm?
- Q9.8(a): A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is (a) a convex lens of focal length 20cm?
- Q9.8(b): A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam ((12))cm from P. At what point does the beam converge if the lens is a concave lens of focal length ((16))cm?
- Q9.8(b): A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is (b) a concave lens of focal length 16cm?
- Q9.9: An object of size ((3.0))cm is placed ((14))cm in front of a concave lens of focal length ((21))cm. Describe the image produced by the lens. What happens if the object is moved further away from the lens?
- Q9.9: An object of size 3.0cm is placed 14cm in front of a concave lens of focal length 21cm. Describe the image produced by the lens. What happens if the object is moved further away from the lens?
Chapters in CBSE - Class 12 Physics
- Electric Charges and Fields
- Electrostatic Potential and Capacitance
- Current Electricity
- Moving Charges and Magnetism
- Magnetism and Matter
- Electromagnetic Induction
- Alternating Current
- Electromagnetic Waves
- Wave Optics
- Dual Nature of Radiation and Matter
- Atoms
- Nuclei
- Semiconductor Electronics
- Communication Systems
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