Question

what is the angle of reflection of ray of light in incident normally to the surface?​

Answer 1

Answer:

Angle of Reflection for a normally incident light ray on a Plane surface is 0° ; because the light goes on the same path as incident on it

Answer 2

Your answer lies in the first law of reflection - The angle of incidence is always equal to the angle of reflection.

When the light is incident of a surface, making an angle [math]\theta_i [/math]with the normal, a part of it is refracted, and the other undergoes reflection, making an angle [math]\theta_t[/math] and [math]\theta_r[/math], respectively.