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A square wire of side 1cm is placed perp...

A square wire of side 1cm is placed perpendicular to the principal axis of a concave mirror of focal length 15 cm at a distance of 20cm. The area enclosed by the image of the wire is

A

`4 cm^2`

B

`6 cm^2`

C

`2 cm^2`

D

`9 cm^2`

Text Solution

Verified by Experts

The correct Answer is:
D
Given focal length of concave mirror
f=-15 cm
u=-20 cm
Magnification `m=f/(u-f)`
`=(-15)/(-20 +15)`
m=3 cm
The area enclosed by the image of the wire =`m^2`
=9cm
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