Question

Find the net deviation after three reflections

Answer 1

Explanation:

➖Find net deviation after 3 successive reflections

➖counterclockwise. now angle of incidence at ➖second incidence.

➖so angle of deviation will be.

➖clockwise. angle of incidence at third surface.

➖now the deviation angle is given as.

➖clockwise. now the total deviation angle will be given by.

➖so the ray will deviate by 220 degree in clockwise direction.