A ray OP of monochromatic light is incident on the face AB of prism ABCD near vertex B at an incident angle of 60∘ (see figure). If the refractive index of the material of the prism is 3, which of the following is (are) correct?
This question has multiple correct options
The ray gets totally internally reflected at face CD
The ray comes out through face AD
The angle between the incident ray and the emergent ray is 90∘
The angle between the incident ray and the emergent ray is 120∘
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Correct options are A) , B) and C)
Ray OP goes parallel to the side BC. Hence the angle of incidence of this ray on the side CD becomes 45∘.
Applying Snell's Law at the point Q,
Hence, this is a case of total internal reflection.
Thus the angle of incidence on Q is equal to the angle of reflection.
This forms 30∘ as angle of incidence on side AD.
By Snell's Law,
Thus the angle between rays OP and RS is 90∘.
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