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单词 converging lens
释义
converging lens

Physics
  • A lens or mirror that can refract or reflect a parallel beam of light so that it converges at a point (the principal focus). Such a mirror is concave; a converging lens is thicker at its centre than at its edges (i.e. it is biconvex, plano-convex, or convexo-concave). Compare diverging lens or mirror.


Astronomy
  • A lens that is thicker at the centre than at the edges, so that parallel light passing through it converges to a focus; also known as a positive lens. A magnifying glass is an example. A converging lens produces a real image, i.e. one that can be seen on a screen. See also diverging lens.


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