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Light: Reflection from Plane Mirrors and Refractive Index
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A plane mirror is in a vertical plane and is rotating about a vertical axis at 100 mm horizontal beam of light is incident on the mirror. The reflected beam will rotate at
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A
$200 rpm$
💡 Explanation:
When a mirror rotates at an angular velocity omega, the reflected ray rotates at an angular velocity of 2*omega. Therefore, if the mirror rotates at 100 rpm, the reflected beam rotates at 200 rpm.