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For an object placed at a distance of 20 cm in front of convex lens, the image formed is at a distance of 20 cm behind the lens.

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For an object placed at a distance of 20 cm in front of convex lens, the image formed is at a distance of 20 cm behind the lens. Find the focal length of lens.

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The object distance and image distance are same. So the object is kept at twice the focal length. So the focal length of the convex lens is 10 cm.

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