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Two plane mirrors are inclined to each other at an angle `theta`. A ray of light is reflected at one
mirror and then at the other. Find the total deviation of the ray.

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Correct Answer - A::B::C
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`delta_(Total)=(delta_(M))+(delta_(N))`
`=(180^(@)-2i)+[180^(@)-2(theta-i)]=360^(@)-2theta`.

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