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Q.

X is a small angle prism of angle 3o made of material of refractive index 1.5. A ray of light is made to incident on it as shown in figure. M is a plane mirror. The angle of deviation for the ray reflected from the mirror M with respect to incident ray is
 

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a

178.5o

b

4.5o

c

177o

d

175.3o

answer is D.

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Detailed Solution

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Angle of deviation for prism is,
d=A(μ−1)=3(1.5−1)=1.50
Angle of deviation for mirror in
d′=180∘−d=1800−1.50=178.50

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