单词	achromatic lens
释义	achromatic lens noun : a lens made by combining lenses of different glasses having different focal powers so that the light emerging from the lens forms an image practically free of chromatic aberration Illustration of achromatic lens A light source B crown glass C flint glass D corrected wavelength focal point Word History First Known Use 1796, in the meaning defined above Medical Definition achromatic lens noun : a compound lens made by combining lenses of different glasses (as flint glass and crown glass) with different focal powers so that the light emerging from the lens forms an image almost free from unwanted colors
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