The focal length of convex lens is 15 cm . Where should be the object placed to obtain a real image three times magnified ?
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On measuring distance BC, it will be found to be equal to 6 cm. Thus, the object is placed at a distance of 6 cm × 5 = 30 cm from the lens (as per the original scale). A concave lens of focal length 15 cm forms an image 10 cm from the lens.
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