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The image formed by a convex mirror of f...

The image formed by a convex mirror of focal length 20 cm is a quarter of the object. What is the distance of the object from the mirror?

A

50 cm

B

45 cm

C

90 cm

D

60 cm

Text Solution

Verified by Experts

The correct Answer is:
D
Here, `f = 20 cm`, `m = h_(2)/h_(1) = (-v)/u = 1/4` or `v = -u//4`
From `1/v + 1/u = 1/f`, `(-4)/u + 1/u = 1/20` or `(-3)/u = 1/20 , u = -60 cm`
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