Question

what happens when a ray of light falls normally on the surface of a mirror? What (1) the angle of incidence (2) the angle of reflection.

Answer 1

When light ray falls normally on the mirror it reflects back in the same medium through the same path.
1)angle of incidence is zero in this case.
2) angle of reflection is also zero in this case.

Answer 2

When a light ray falls on the mirror it will reflect. The angle of incidence=angle of reflection