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A luminous point object is moving along ...

A luminous point object is moving along the principal axis of a concave mirror of focal length 12cm towards it. When its distance from the mirror is 20cm its velocity is `4cm//s`. The velocity of the image in `cm//s` at that instant is

A

6, towards the mirror

B

6, away from the mirror

C

9, away from the mirror

D

9, toward the mirror

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