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Q.

A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 50and the prism is made of a material of refractive index 1.5 the angle of incidence is

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a

7.50

b

50

c

150

d

2.50

answer is A.

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Detailed Solution

as it is coming out normally  i2=0 then r2=0     hence r1=Afor small angle sin i1sin r1=i1r1 =μi1=μr1=1.5×5 =7.5
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