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Engineering
5 months, 1 week ago

# A ray parallel to M2 is incident on M1 mirror, after two reflections it become parallel to M1 as shown, find angle theta

$x+2(90-\theta)+\theta=180\\\Rightarrow x=\theta\\y+2(90-\theta)+\theta=180\\\Rightarrow y=\theta\\3\theta=180\\\theta=60^o$