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Question

The refracting angle of the prism is 60o and minimum deviation of 30o, then the angle of incidence is:-

A
30o
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B
45o
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C
25o
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D
60o
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Solution

The correct option is B 45o
A=60Sm=30
we know,
μ=sin(A+Sm2)sin(A2)
μ=sin(60+302)/sin(602)μ=sin45sin30=12/12
μ=2(1)
at min deviation condition, r2=r1=A2=30μisini=μrsinr11×sini=2×sin30sini=2×12=12i=45

2007724_1218674_ans_76bd233bb21749e0af273e7a530acdd7.jpg

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