There are two plane mirrors placed at some angle θ with each other. A ray incident on the first mirror travels parallel to the second mirror after reflection and it travels parallel to the first mirror after two successive reflections. Find angle θ between the mirrors.

Question

There are two plane mirrors placed at some angle θ with each other. A ray incident on the first mirror travels parallel to the second mirror after reflection and it travels parallel to the first mirror after two successive reflections. Find angle θ between the mirrors., 90 °, 60 °, 120 °, 30 °

MARKS App · Accepted Answer

δ = 90 + α - θ 90 + α - θ = θ and 90 - α = θ 180 - θ = 2 θ θ = 60 °

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