Light beams refracting in a lens causing them to converge. Light changes direction, or is refracted, when it meets a different transparent medium such as a lens. A biconvex lens causes light beams to converge. It is used to correct hypermetropia (long-sightedness), a condition in which light is focused behind the retina.

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TOP22299224

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達志影像

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RM

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須由TPG 完整授權

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