Index glass

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the mirror on the index of a quadrant, sextant, etc.

See also: Index

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29 splicing of two gradient index glass fibers (mm) 1 728 st, - 1.
8, 24mm NIKKOR wide-angle lens which includes high refractive index glass elements for exceptionally sharp images with high contrast and highly advanced VR image stabilisation.
5Eu magnification features all-glass elements made from high-refractive index glass and demonstrates low chromatic aberration and distortion.