Mirrors-Mirror-Mirrors!?

Question

Relative to the size of the mirror, what happens to the size of your own face as you look at it and move away from the mirror?

Question2: You are standing in front of the mirror looking at the reflection of the face of the person standing behind you. The person backs away from the mirror. Relative to the size of the mirror, what happens to the size of the reflection of their face (as measured by you on the surface on the mirror)

What is the minimum height of (length of mirror) of a plane (flat) mirror mounted vertically on a wal that would be required for a person to see his/her whole body when standing upright in front of the mirror?

Answer 1

For question 1 and 2 the answer is the size of the face will get reduced as per the law of perspective of vision. For example , view the electric posts  which are linedup. As distance increases the accommodation capacity of the eyes reduce as the light passes thro the lense of our eyes.

For question 3  the height of the mirror should be half the upright size of the object in front of it. This is based on the geometry of midpoint theorem in a triangle. The straight line joining the mid points of any two sides will be parallel to the third side and will be of half in length of it.