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A ray of light is incident at an angle 6...

A ray of light is incident at an angle `60^@` on a horizontal plane mirror.Through what angle ,should the mirror be tilted to make the reflected ray horizontal?

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A ray of light is incident at an angle 60° on a horizontal plane mirror.
To make the reflected ray horizontal, the reflected ray must turn through 90° -60° = 30° =`theta`
Mirror must be turned through an angle
`=theta/2 = 30/2 = 15^(@)`
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