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CBSE Class 12 Physics 2016 Outside Delhi Set 1 Paper

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Question : 7 of 26
Marks: +1, -0
A ray PQP Q incident normally on the refracting face BABA is refracted in the prism BAC made of material of refractive index 1.5. Complete the path of ray through the prism. From which face will the ray emerge? Justify your answer.
Solution:  
Path of emergent ray
Naming the face
Justification
Face-AC
Here ic=sin⁡−1(23)i_c = \sin^{-1}\left(\frac{2}{3}\right)
=sin⁡−1(0.6)= \sin^{-1}(0.6)
∠i\angle i on face ACAC is 30∘30^{\circ} which is less than ∠ic\angle i_c . Hence the ray get retracted here.
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