A small plane mirror is placed at the centre of a spherical screen of radius R. A beam of…
Physics · JEE Main · NTA Exams — Optics
A small plane mirror is placed at the centre of a spherical screen of radius R. A beam of light is falling on the mirror. If the mirror makes n revolutions per second, the speed of light on the screen after reflection from the mirror will be
- 4 πnR
- 2 πnR
- nR/2π
- nR/4π
Answer
(A) 4 π nR
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