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

The image formed by a convex mirror of focal length `30 cm`. is a quarter of the object. What is the distance of the object from the mirror ?

A

30cm

B

60cm

C

90cm

D

120cm

Text Solution

Verified by Experts

The correct Answer is:
C
Given, f=+30cm and `m=(1)/(4)`
Magnification, `m=(f)/(f-u)`
`therefore (30)/(30-u)=(1)/(4)`
30-y=120 `Rightarrowu=-90cm`
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