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The Engineering Language by Ronald Hanifan

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ABBE CONSTANT    Ration of refractivity of a material to its dispersion. Also called the Nu or Vee value. A calculated value from known indices of refraction.

ABERRATION    (1) Generally, any systematic deviation from an ideal path of the image-forming rays passing through an optical system that causes the image to be imperfect. Specific aberrations are spherical aberrations, coma, chromatic aberration, and distortion. (2) The phenomenon caused by rotation of the earth in its orbit that is sufficient to cause the light from a star to appear to shift forward. For those starting at right angles to the direction of the earth’s travel, the maximum ...

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