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

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Angle Theta can be found out by understanding the image and calculating the required angles:

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

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