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Q. When an object is kept at a distance of 30cm from a concave mirror, the image is formed at a distance of 10cm from the mirror. If the object is moved with a speed of 9cms1, the speed (in cms1) with which image moves at that instant is _______.

JEE MainJEE Main 2020Ray Optics and Optical Instruments

Solution:

|(dvdt)|=|v242||dudt|=(1030)2×9=1m/s