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# A ray of light incident at an angle θ on a refracting face of prism emerges from the other face normally. If the angle of the prism is 5 and the prism is made of material of refractive index 1.5, the angle of incidence is7.5∘.5∘.15∘.2.5∘.

A
7.5.
B
5.
C
15.
D
2.5.
Solution
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#### We have deviation, δ=(M−1)Aδ=(1.5−1)5∘=2.5∘The angle of the prism is 50°.The ray emerges from refracting face of a prism normally.Then, i2=r2=0As, A=r1+r2=0r1=Ar1=50°But i1=μr1=32×5=7.5°

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