A beam oflight from a source 
is incident normally on a plane mirror fixed at a certain distance 
from the source. The beam is reflected back as a spot on a scale placed just above the source 
. When the mirror is rotated through a small angle 
the spot of the light is found to move through a distance 
on the scale. The angle 6 is given by
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
: When mirror is rotated by 
angle reflected ray will be rotated by 
. For small angle 
,
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