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Q.

Two plane mirrors are inclined at an angle of 600 with each other. An incident ray hits one of the mirror at an angle of 800 with the normal. Its angle of deviation after two reflections (in degrees) is 

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a

60

b

120

c

80

d

20

answer is B.

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Detailed Solution

Angle of incidence is more than angle between mirrors. Hence angle of deviation is 2θ = 120

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