Question

on which face of a right angled isosceles prism should a light ray incident normally for it to be deviated by 180
State one application of the prism when aligned in such a manner.
Draw a rough diagram and attach pls
Pls. Pls. Answer fast

Answer 1

Answer:

The incident ray is incident normally on face AC, so angle of refraction at face AC is also zero. Angle of incident i, Which the ray makes with normal to face AB is 45o. Since this angle is greater than critical (=sin−11.51=41⋅8o), the ray suffers total internal reflection. Now, i=r. The reflected ray from the face AB is now incident on face BC, at angle of incidence again 45o and for the same reason it is turned back