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An object is moving towards a concave mi...

An object is moving towards a concave mirror of focal length 24 cm. When it is at a distance of 60 cm from the mirror, its speed is `9 cm//s`. The speed of its image at that instant , is

A

`4 cm//s` towards the mirror

B

`6 cm//s` towards the mirror

C

`4 cm//s`away from the mirror

D

`6 cm//s`away from the mirror

Text Solution

Verified by Experts

The correct Answer is:
C
`1/v+1/(-60)=(1/-24)`
`:. V= -40 cm`
`m=-(v/u)= -((40)/(-60))=(-2)/(3)`
Image speed is `m^(2)`-times the object speed and opposite to the direction of object velocity.
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