A plane mirror reflecting a ray of incident light is rotated through an angle $θ$ about an axis through the point of incidence in the plane of the mirror perpendicular to the plane of incidence then

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the reflected ray does not rotate

the reflected ray rotates through an angle $θ$

the reflected ray rotates through an angle $2 θ$

the incident ray is not fixed

answer is C.

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Detailed Solution

If the plane mirror is rotated lay an angle $θ$ in anti clock wise direction wise direction but source is fixed then the reflected ray is turned by angle $2 θ$ in the anti clock wise direction

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