Worksheet

1.

The image formed by a concave mirror is virtual, erect and magnified. The position of object is :

a.

at focus

b.

between focus and centre of curvature

c.

at pole

d.

between pole and focus

2.

Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (ii) from water into air.

3.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed (c) at centre of curvature of the mirror

4.

A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under: Position of candle = 12.0 cm, Position of convex lens = 50.0 cm, Position of the screen = 88.0 cm. (i) What is the focal length of the convex lens?

5.

Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water;

6.

A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under: Position of candle = 12.0 cm, Position of convex lens = 50.0 cm, Position of the screen = 88.0 cm. (iii) What will be the nature of the image formed if he further shifts the candle towards the lens?

7.

A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.

a. Plane, convex and concave b. Convex, concave and plane c. Concave, plane and convex d. Convex, plane and concave

8.

Under what condition in an arrangement of two plane mirrors, incident ray and reflected ray will always be parallel to each other, whatever may be angle of incidence. Show the same with the help of diagram.

9.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed (d) a little beyond centre of curvature of the mirror

10.

Which of the following ray diagrams is correct for the ray of light incident on a lens shown in Fig. 10.7?

a.

Fig. A.

b.

Fig. B.

c.

Fig. C.

d.

Fig. D.

11.

A student focussed the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under: Position of candle = 12.0 cm, Position of convex lens = 50.0 cm, Position of the screen = 88.0 cm. (iv) Draw a ray diagram to show the formation of the image in case (iii) as said above.

12.

Q1.The angle of incidence is equal to the angle of reflection. This is known as:

a.

Snell's Law

b.

Law of Reflection

c.

Refraction principle

d.

Dispersion law

13.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed (e) at infinity

14.

Magnification produced by a rear view mirror fitted in vehicles

a. is less than one b. is more than one c. is equal to one d. can be more than or less than one depending upon the position of the object in front of it

15.

The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as $A$, $B$, $C$ and $D$ in Figure 10.5. Which one of them is correct?

a.

A

b.

B

c.

C

d.

D

16.

Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

a. 15 cm in front of the mirror b. 30 cm in front of the mirror c. between 15 cm and 30 cm in front of the mirror d. more than 30 cm in front of the mirror

17.

The real image formed by a concave mirror is smaller than the object if the object is :

a.

between centre of curvature and focus

b.

at a distance greater than radius of curvature

c.

at a distance equal to radius of curvature

d.

at a distance equal to focal length

18.

Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case. (c) Object is placed between infinity and device, image formed is diminished and between focus and optical centre on the same side as that of the object.

19.

Draw ray diagrams showing the image formation by a convex lens when an object is placed (d) at infinity

20.

Draw ray diagrams showing the image formation by a concave lens when an object is placed (c) beyond twice the focal length of the lens