Question

2 plane mirrors M1 and M2 are inclined at angle theta. A ray of light 1 which is parallel to strikes M2and after 2 reflection ,the ray to becomes parallel to M2.Find the angle theta​

Answer 1

Hey mate ^_^

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Answer:
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Here 

∠M1OM2 = ∠DCM2=θ

∠M1BA=∠M1OM2=θ

α=90°−θ

x=90°−α

x=90°−(90−θ)

x=θ

Similarly

β=90°−θ

y=90°−β

y=90°−(90−θ)

y=θ

So all angle x, y and θ are equal BOC is equilateral triangle.

θ=60°

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