Question

A person is standing in front of a plane mirror. If the mirror recedes with velocity $v$, then the velocity of his image is

• A. $0$
• B. $v$
• C. $2v$
• D. $\frac{v}{2}$

Answer 1

The correct option is C $2v$

Plane mirror makes an image at a distance inside the mirror that is equal to the distance of the person from the mirror. So, the image also moves at the same velocity towards the man.
$V_i=2V_m=2\times (-v)=-2v$