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Where An Object Should Be Placed Before A Concave Mirror Of Focal Length 20 Cm So That A Real Image Is Formed At A Distance Of 60 Cm From It?

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Where An Object Should Be Placed Before A Concave Mirror Of Focal Length 20 Cm So That A Real Image Is Formed At A Distance Of 60 Cm From It? where an object should be placed before a concave mirror of focal length 20cm so that a real image is formed at a distance of