when plane mirror rotates through an angle theta reflected ray rotates 2 theta so spot on screen will make 2n revolution per second why 2n whats d relation of it with n for qsn a small plane mirror placed at centre of a spherical screen of radius R .a beam of light is falling on mirror if mirror makes n revolutions per sec.speed of 18 cm screen after reflection from mirror

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Solution

$T h e r e q u i r e d f o r m u l a i s 2 n = \frac{2 θ}{2 π t}, w h e r e t i s t h e t i m e o f r o t a t i o n . a n d t = 2 R / c, w h e r e R a n d c a r e d i s \tan c e b e t w e e n t h e m i r r o r a n d s p h r i c a l s c r e e n a n d v e l o c i t y o f l i g h t .$

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