A ray of light travels from a light source 'S' to an observer after reflection from a plane mirror. If
the source rotates in the clockwise direction by 10°, by what angle and in what direction the
mirror should be rotated so that light ray still strikes the observer.
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Answer:
mirror should be turned by 5 degree angle in anti clockwise direction
Explanation:
If we turn the mirror by some angle "theta" then the reflected ray will rotate by double angle "2theta" after reflection
So here we know that incident light is rotated by angle 10 degree in clockwise direction
Now in order to meet the reflected ray with observer then we need to turn the mirror in opposite direction by half of the required angle
so mirror should be turned by 5 degree angle in anti clockwise direction
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Topic : ray optics
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