# A ray of light is incident normally on one face of an equilateral prism of refractive index 1.5. The angle of deviation is: (Given sin^-1.(2)/(3)=4

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A ray of light is incident normally on one face of an equilateral prism of refractive index 1.5. The angle of deviation is: (Given sin^-1.(2)/(3)=42^@)
A. 30^@
B. 45^@
C. 60^@
D. 75^@

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Correct Answer - C

sinC=1/mu=(1)/(3//2)=2/3impliesC=sin^-1(2/3)=42^@
Refraction at AC
i(=60^@)gtC, T.I.R. takes place at AC.
After T.I.R. ray is incident normally on CB
60^@+60^@+delta=180^@impliesdelta=60^@`

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