Question

If the angle of incidence is at ${30}^{\circ }$. The angle of deflection, after reflecting 2 times is ___.

Answer 1

Deviation at B = π - (2i)

= π - 2 (${30}^{\circ }$)

= π - ${60}^{\circ }$ = ${120}^{\circ }$

Deviation at A = π - 2i =

= π - 2 (${30}^{\circ }$)

= ${120}^{\circ }$