What is the power of a lens?
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In biology, the smallest unit that can live on its own and that makes up all living organisms and the tissues of the body. A cell has three main parts: the cell membrane, the nucleus, and the cytoplasm. ... Parts of a cell. A cell is surrounded by a membrane, which has receptors on the surface.
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The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). ... Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.
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