
In optics, an index-matching material is a substance, usually a liquid, cement (adhesive), or gel, which has an index of refraction that closely approximates that of another object (such as a lens, material, fiber-optic, etc.). When two substances with the same index are next to each other, light passes from one to the other with neither reflectio...
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http://en.wikipedia.org/wiki/Index-matching_material

a material, often a liquid or cement, whose refractive index is nearly equal to the core refractive index, used to reduce Fresnel reflections from a fibre end face
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=731-05-27

Normally a gel or liquid with a refractive index that is almost equal to the core index. Normally used to reduce reflections at a fibre end face.
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http://www.encyclo.co.uk/visitor-contributions.php
No exact match found.