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Q.

A monochromatic light is incident at a certain angle on an equilateral triangular prism and suffers minimum deviation.  If the refractive index of the material of the prism is 3, then the angle of incidence is

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a

900

b

450

c

600

d

300

answer is A.

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Detailed Solution

r1=r2=A2=60°2=30°

Using snell’s law at the interface,

1 sin i = 3sinr1

sin i = 3sin30°=3/2

i = 600

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