A point source S is located on a wall. A plane mirror M having length $ℓ$ is moving parallel to the wall with constant velocity $v$ . The bright patch formed on the wall by reflected light will

Question

A point source S is located on a wall. A plane mirror M having length ℓ is moving parallel to the wall with constant velocity v . The bright patch formed on the wall by reflected light will

TestHub · Accepted Answer

SA = 2 x , SB = 2 ( x + ℓ ) AB = SB − SA = 2 ℓ Length of the patch will be = 2 ℓ SA = 2 x SA ′ = 2 ( x + d ) S A ′ − S A = 2 ( x + d ) − 2 x = 2 d So if plane mirror is moved then patch will move 2 d in same time so velocity of patch will be 2 v if velocity of mirror is v .

Physics - Geometrical Optics Question with Solution | TestHub

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JEE Main - 1 year (12th class)