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A point object 'O' approaches a biconvex...

A point object 'O' approaches a biconvex lens of focal length 40cm along its optic axis with a speed of 10cm/s while the later receeds away from the former with a speed of 4cm/s. Find the speed and direction of motion of the image when the object is at a distance of 60cm from the lens. 4 cm/s 10 cm/s

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