Question:
A ray of light is incident on a plane mirror at an angle of 30°. At what angle with the horizontal must a plane mirror be placed so that the reflected ray becomes vertically upwards?
A ray of light is incident on a plane mirror at an angle of 30°. At what angle with the horizontal must a plane mirror be placed so that the reflected ray becomes vertically upwards?
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For a ray to be reflected vertically, the angle of the mirror with the horizontal should be half of the angle of incidence.
Updated On: Jan 12, 2026
- 40°
- 20°
- 30°
- 60°
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The Correct Option is B
Solution and Explanation
The angle of reflection must be equal to the angle of incidence, and for the reflected ray to be vertical, the angle of the mirror with the horizontal should be \( 20^\circ \). This ensures the total angle of reflection is 90°.
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