Focal length of lens is - 25 cm . Calculate power of lens . Mention type of lens
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The focal length of a lens is usually measured in meters and the power of the lens is measured as Dioptre. A focal length of 1 meter gives 1 dioptre power of the lens. Since it is a positive focal length, the lens will be a convex lens or a converging lens and the power is written as '+'
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