achromatic prism

noun

Definition of achromatic prism 

: a prism made by combining two or more prisms of different refractive index so designed and placed that a ray of white or other nonhomogeneous light passing through the prism is deviated but not dispersed into a spectrum — compare amici prism

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First Known Use of achromatic prism

1802, in the meaning defined above

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The first known use of achromatic prism was in 1802

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