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Two plane mirrors are inclined at an angle of 60⁰with 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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120

$60$

answer is B.

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Detailed Solution

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

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