An object `3 cm` tall is placed on the principal axis of a concave mirrorr of focal length `9 cm` at a distance of `12 cm` form is. What is the nature and size of the image ?

Options

A. real, `9cm`
B. virtual, `9 cm`
C. real , `1cm`
D. virtual, `1 cm`

Answer

A

Explanation

`m=(-9)/(-9-(-12))=(-9)/(3)` or `m=-3`
or `(I)/(O)=-3`or `I=-3xx3cm` or ` I=-9cm`
The negative sign indicates that the image is real.