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A ray of light travels from a light sour...

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 is what direction must the mirror be rotated so that the light ray still strikes the observer?

Text Solution

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`theta+alpha-10^@=beta and theta=beta+alpha`
`rArr alpha=5^@` clockwise
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