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Wave Optics EXERCISES Solutions
- Q10.1(a): Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) reflected light? Refractive index of water is 1.33.
- Q10.1(b): Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (b) refracted light? Refractive index of water is 1.33.
- Q10.2(a): What is the shape of the wavefront in each of the following cases: (a) Light diverging from a point source.
- Q10.2(b): What is the shape of the wavefront in each of the following cases: (b) Light emerging out of a convex lens when a point source is placed at its focus.
- Q10.2(c): What is the shape of the wavefront in each of the following cases: (c) The portion of the wavefront of light from a distant star intercepted by the Earth.
- Q10.3(a): The refractive index of glass is 1.5. What is the speed of light in glass? (Speed of light in vacuum is $3.0 \times 10^8$ m s$^{-1}$)
- Q10.3(b): Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism?
- Q10.4: In a Young’s double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment.
- Q10.5: In Young’s double-slit experiment using monochromatic light of wavelength $\lambda$, the intensity of light at a point on the screen where path difference is $\lambda$, is $K$ units. What is the intensity of light at a point where path difference is $\frac{\lambda}{3}$?
- Q10.6(a): A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young’s double-slit experiment. (a) Find the distance of the third bright fringe on the screen from the central maximum for wavelength 650 nm.
- Q10.6(b): A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young’s double-slit experiment. (b) What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide?
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
- Ray Optics and Optical Instruments
- Dual Nature of Radiation and Matter
- Atoms
- Nuclei
- Semiconductor Electronics
- Communication Systems
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