$A$ 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 the reflected light spot on the screen will be:
- A$4\pi nR$
- B$2\pi nR$
- C$\frac{nR}{2\pi}$
- D$\frac{nR}{4\pi}$
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