If the angle of incidence is at 30∘. Find the angle of deflection, after reflecting 2 times.
240º
Deviation at B = π - (2i)
= π - 2 (30∘)
= π - 60∘ = 120∘
Deviation at A = π - 2i
= π - 2 (30∘)
= 120∘
Total deviation = 240∘