A plen mirrore, reflecting a ray of inci...

A plen mirrore, reflecting a ray of incident light, is rotated through and angle `theta` about an axis through the point of incidencein the plane of the mirror and perpendicular to the plane, the refrlected ray

does not rotate.

rotates through an angle `(frac(theta)(2))`.

rotates through an angle `theta`.

rotates through an angle `(2theta)`

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