a small plane mirror is placed at the center of a spherical screen of radius R .A beam of light is falling on the mirror .If the mirror makes n revolutions power second , the speed of the spot of the light on the screen after reflection from the mirror will be
Answer (1)
Student Expert
2nd May, 2020
Hey!
As we know, when plane mirror rotates through an angle θ , the reflected ray from the mirror rotates through an angle 2θ. So, spot on the screen will make 2 x n = 2n revolutions per second (frequency).
To find the velocity :
v=2πR x frequency
=2π x R x 2n
=4πnR m/s
Hope it helped to clear your delimma.
Thank you.
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