Questions
A ray OP of monochromatic light is incident on the face AB of prism ABCD near vertex B at an incident angle of 60º as shown in figure. If the refractive index of the material of the prism is , which of the following is(are) correct ?
detailed solution
Correct option is A
Applying Snell’s law at face AB, we get
(where, is the critical angle)
From geometry, angle of incidence at Q is 45º. At face CD angle of incidence is greater than . Therefore, the rays gets totally internally reflected at face CD. Hence, option (a) is correct. From geometry, angle of incidence at R is 30º. At face AD angle of incidence is less than So, the ray comes through face AD. Hence option (b) is correct. Applying Snell’s law at face AD, we get
The angle between the incident ray and the emergent ray is 90º.
Hence, option (c) is correct and option (d) is incorrect
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