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When an object is kept at a distance of 30cm from a concave mirror, the image is formed at a distance of 10 cm. If the object is moved with a speed of `9cm s^(-1)` the speed with which the image moves is

A

`0.1 m//s`

B

`1 m//s`

C

`3 m//s`

D

`9 m//s``

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The correct Answer is:
B
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