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Question

When an object is kept at a distance of 30 cm from a concave mirror, the image is formed at a distance of 10 cm. If the object is moved with a speed of 9 cm s1 the speed with which the image moves is

A
0.1cms1
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B
1cms1
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C
3cms1
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D
9cms1
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Solution

The correct option is C 1cms1
1u+1v=1f
duu2dvv2=0 or dvv2duu2
or dv=v2u2du
=10×1030×30×9 cms1=1 cms1.

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