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.

Explanation

`A_("image") = m^(2) A _(obj)`
`:. , A_("image ") = [ (f )/( f-u)] ^(2) A_(obj)`
`= [ (-10)/( -10+ 25)] xx 3 xx 3 = 4 cm^(2)`