Published by:
CGP EDU Academic Team
Published on: August 14, 2026
A light ray is incident on a plane mirror 
. The mirror is rotated in the direction as shown in the figure at a frequency 
revolutions per second. The light reflected by the mirror is received on the wall at a distance 10 m from the axis of rotation. When the angle of incidence becomes 
, the speed of the spot on the wall is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
When mirror is rotated with angular speed ' 
' the reflected rav will rotate with 
.
When mirror is rotated with angular speed ' 
' the reflected ray will rotate with 
Speed of the spot
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