The image of an object formed by a convex lens is of the same size as the object. If the image is formed at a distance of 40 cm, find the focal length of the lens. At what distance from the lens is the object placed?
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if it is of the same size the image will be formed on c2 and the and object is on c1 so the distance of image and object from the pole is same and the focal length will be radius of curvature by 2 20cm
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