A square wire of side `3.0 cm` is placed `25 cm` away from a concave mirror of focal length `10 cm`. What is the area enclosed by the image of the wire ? The centre of the wire is on the axis of the mirror, with its two sides normal to the axis.

Options

A. `7.5cm^(2)`
B. `6.0cm^(2)`
C. `4.0cm^(2)`
D. `3.0cm^(2)`

Answer

C

Explanation

`1/10=1/25 + 1/v`
Areal magnification
`=v^(2)/u^(2)=("Area of the image")/("Area of the objec")`