angle-of-incidence-is-measured-between-the-incoming-ray-and-which-reference-line

Question

In plane-mirror optics, the angle of incidence is measured between the incoming ray and which reference line?

Accepted Answer

The normal to the mirror surface at the point of incidence

Answer

A horizontal line through the observer’s eye

Answer

The mirror surface itself along the reflecting face

Answer

The reflected ray after it leaves the mirror