Page 3 - HA-reflection through concave mirror

a) erect and on the same side as the object.

b) erect and on the other side of the object.

c) inverted and on the same side as the object.

d) inverted and on the other side as the object.

Subjective Questions:

1. Why are concave mirrors used as dentists mirror and shaving mirrors?

2. Why headlights of vehicle has concave mirror?

3. A concave mirror is held in water. What should be the change in its focal
length?

4. A student has three concave mirrors A, B, C of focal lengths 20 cm, 15 cm
and 10 cm respectively. For each concave mirror he performs the

experiment of image formation for three values of object distance of 30 cm,

10 cm and 20 cm. Giving reason answer the following:

(a) For the three object distances identify the mirror which will form an
image equal in size to that of object. Find at least one value of object

distance.

(b) Out of the three mirror identify the mirror which would be preferred to be

used for shaving purpose.

(c) For the mirror B draw ray diagram for image formation for any two

given values of object distance.

5. When sunlight is concentrated at a paper at the principal focus of a

concave mirror, what happen to the paper?