Question

find the angle of reflection in the given case and give reason​

Answer 1

angle of reflection and angle of incidence both are 0°
Because the angle made with normal is 0° since the Normal drawn to the plane at the point of incidence and and the reflected ray coincide so there is no angle

Answer 2

here is your answer mate.....

the angle will be same that Is...

angle i = angle r in this case that Is 90°

hope it helps you....