Physicshard · Past Paper
A ray of light is incident on a plane mirror. If the mirror is rotated by 10 degrees, the reflected ray rotates by:
A10 degrees
B20 degrees
C5 degrees
D0 degrees
✓ Correct Answer: B — 20 degrees
If the mirror is rotated by theta, the reflected ray rotates by 2*theta, provided the incident ray direction is fixed.
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