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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

30 cm

B

60 cm

C

90 cm

D

120 cm

Text Solution

Verified by Experts

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