Question

You are standing 1.2 m from a mirror, and you want to use a classic camera to take a photo of yourself. This camera requires you to select the distance of whatever you focus on.

What distance do you choose?

Answer 1

here,

for a plane mirror

object distance is equal to image distance

Now,

focus distance = object distance + image distance from the mirror

foucs distance = 2 * object distance

focus distance = 2 * 1.2 m = 2.4 m