Question

define the normal at the point of incidence​

Answer 1

incident ray is the ray which comes in the surface wild reflected ray is the raviz go back while the middle between both is known as normal ...

Answer 2

-The condition in which a wave-front is parallel to an interface, such that the ray path is perpendicular (normal) to the surface. The angle of incidence is zero.

- SNELL'S LAW

sin i/sin r

- SH

(hope it helps ya.... i hope its correct.......)