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Question

An observer moves towards a stationary plane mirror at a speed of 4ms1. Determine the velocity of the image with respect to the mirror:

A
8ms1
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B
4ms1
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C
2ms1
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D
16ms1
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Solution

The correct option is B 4ms1
In case of plane mirror,magnification is unity.Hence m=1
vu=1
-v=u.
Differentiating above equation w.r.t t
dvdt=dudt

Hence velocity of object w.r.t mirror is equal to negative velocity of image w.r.t mirror.



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