how much measurement should there to get a clear image in covex lens
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For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens. For a converging lens (for example a convex lens), the focal length is positive and is the distance at which a beam of collimated light will be focused to a single spot.
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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 50 cm from the lens at what distance from the lens is the object placed.
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