Question

what is mean by normal ray​

Answer 1

Explanation:

In optics, a normal ray is a ray that is incident at 90 degrees to a surface. That is, the light ray is perpendicular or normal to the surface. The angle of incidence (angle an incident light ray makes with a normal to the surface) of the normal ray is 0 degrees.

Answer 2

Answer:

a normal ray is a Ray of incident at 90degree to its surface,that is the. light ray perpendicular or normal to the suface the angle of incident of normal ray is 0°