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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
image
`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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