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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 from the mirror. If the object is moved with a speed of 9 cms-1, the speed (in cms-1) with which image moves at the instant is ___

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Detailed Solution

Mirror Formula, 1v+1u=1f⇒1v2dvdt=-1u2dudt⇒dvdt=-v2u2dudt∴dvdt=-103029⇒dvdt=1 cm/sec

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