For a fixed incident light ray, if the mirror be rotated through and angle `theta` (about an axis which lies in the plane of mirror and perpendicular

Question

For a fixed incident light ray, if the mirror be rotated through and angle `theta` (about an axis which lies in the plane of mirror and perpendicular

For a fixed incident light ray, if the mirror be rotated through and angle `theta` (about an axis which lies in the plane of mirror and perpendicular to the plane of incidence), show that the reflected ray turns through an angle 2`theta` in same sense.

Monjur Alahi

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2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

see figure `M_(1), N_(1)` and `R_(1)` indicate the initial positon of mirror, initial position of mirror, initial normal and initial direction of reflected light may respectively. `M_(2). N_(2)` and `R_(2)` indicate the final positon of mirror,final normal and final direction of reflected light ray respectively. From figure it is clear that `/_ABC = 2phi + delta = 2(phi + theta)` or `delta = 2theta`