Figure shows a plane mirror onto which a light rays is incident. If the incident light ray is rotate

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Figure shows a plane mirror onto which a light rays is incident. If the incident light ray is rotated by `10^(@)` and the mirror by `20^(@)`, as show in figure below, find the angle by which the reflected ray is rotated.
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Guys they r not fast we need to clear our concepts before solving the questions. That's the reason I understood.
Edit : Now don't say that if my concepts are clear than y I m here, I m here just coz I want to check my answer.

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