Question

Concave mirror Object distance (in cm) Focal length (in cm)

1 10 15

2 20 10

3 30 20

(i) Out of the three, in which case will the mirror form the image which has the same size as the

object?

(ii) Which mirror is being used as a shaving mirror?

(iii) Draw the ray diagram for part (i).​

Answer 1

Answer:

i) 2 ii) plane mirror

Explanation:

i) focal length is half of radius of curvature

ii) we need exact image to shave