Size of the image of an object by a concave lens of focal length 20cm is observed to be reduced to 1/2 of it's size find the distance of the object
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lol I don't know
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object distance from the optical centre of the lens is 40cm. a/c to question, size of image = 1/3 × size of object. hence, object is placed 40cm from the pole of concave lens.
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