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JEE-MAIN 2020
03-09-2020 S2
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 from the mirror. If the object is moved with a speed of 9 $\mathrm{cms}^{-1}$, the speed (in $\mathrm{cms}^{-1}$ ) with which image moves at that instant is $\_\_\_\_$ .
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