A luminous point object is moving along the principal axis of a concave mirror of focal length 12 cm towards it. When its distance from mirror is 20 cm its velocity is 
. The velocity of the image in 
at that instant is:
A
towards the mirror
B
away from the mirror
C
away from the mirror
D
towards the mirror
Text Solution
Verified by ExpertsThe correct answer is:
C
Using mirror formula, 
[ 
is constant]
(towards mirror), 
So 
-ve so away from the mirror.
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