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A light ray is incident on a plane mirror, which after getting reflected strikes another plane mirror, as shown in figure. The angle between the two mirrors is 60º. Find the angle 'θ' shown in figure.

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If light is incident on first mirro at angle ϕ  then

in triangle ABC

2.ϕ + [90–(30 + ϕ)] + θ = 180º 

2ϕ + 120 - 2ϕ + θ = 180º 

θ = 60º

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