Question

17. (a) Complete the ray diagram given below:

(b) Write two uses of concave mirror.

(c) Write one use of convex mirror.

18. a) Write the two laws of reflection of light.

b) What is the difference between a real and a virtual image?

c) A mirror has focal length, f = +10 cm. Is it concave or convex?​

Answer 1

17. b) 2 uses of Concave Mirror:

• They are used as shaving mirrors.

• They are used in Solar Cookers.

17. c) 2 uses of convex mirror:

• Used in parking lots at turns/bends.

• Used as vehicle rear view mirrors.

18. a) Law of Reflection

• The angle of incidence is equal to the angle of reflection.

• The incident ray, normal and the reflected ray lies on the same plane.

18. b) A real image has to be projected on a screen and is usually produced in front of the mirror.

But a virtual image cannot be projected on a screen and is formed behind the mirror.

18. c) f = +10 cm.

Since, the focal length is positive, hence it will be a convex mirror.

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Answer 2

17 (b) Write two uses of concave mirror

1. Concave mirror are used as shaving mirror to see a large image of the face.
2. Concave mirror are used by dentists to see the large image of teeth of patients.

(C) Write one use of convex mirror

1. Convex mirrors are used as a rear view mirrors of side view mirrors in vehicles to see the traffic at the rear side on the road.

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18. a) Write the two laws of reflection of light.

1. The reflected ray, normal and the incident ray lies on the same plane.
2. The angle of incidence is equal to the angle of reflection.

b) What is the difference between a real and a virtual image?

The image which can be obtained on a screen is called real image.

and

The image which cannot be obtained on the screen is called virtual image.

c) A mirror has focal length, f = +10 cm. Is it concave or convex?

It's focal length is positive so, it is convex mirror.