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Question

A plane mirror is receding away from an observer at rest with a speed of 5 cm/s. If the observer can see his image in the mirror, then image recedes away with speed of 


A
25 cm/s
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B
15 cm/s 
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C
20 cm/s
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D
10 cm/s
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Solution

The correct option is D 10 cm/s

Perpendicular to the mirror,
Velocity of the object w.r.t mirror = Velocity of the image w.r.t to mirror
vom=vim 
vovm=(vivm)
05=(vi5)
[ taking rightward as + ]
vi=10 cm/s
Image recedes away at speed of 10 cm/s.

Physics

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