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Grade: 12th pass
        
A ray is incident at an angle of incidence i on one surface of a prism of small angle A and emerge normally from opposite surface. If the refractive index of the material of prism is mue the angle of incidence i is nearly equal to
(A) A/mue    (B)A/2mue
(C)mueA      (D)mueA/2
2 years ago

Answers : (1)

Eshan
askIITians Faculty
2095 Points
							
Dear student,

From geometry, the angle of refraction from the first surface in this case will be equal to the prism angle as shown in figure.
568-164_Untitled.png
From Snell’s law,

sin i=\mu sinA
SinceAis small,

sin A\approx A
\implies sin r=\mu A
\implies r\approx sin r=\mu A
one year ago
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