Question

what are the value of angle of incident i and angle of reflection R for the normal inidence​

Answer 1

As we know that there are two laws of reflection of light that are :

(i) The angle of incidence is equal to the angle of reflection.

i.e. Angle I = Angle R

(ii) The angle of incidence, angle of reflection and the normal all lie on the same plane.

So the value for angle of incidence is equal to angle of reflection for the normal.

In the attachment

Angle i = Angle r

Important Note :- Angle is always measured by comparing with the normal not with the surface.