from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A fusion of two triangular prisms
- n. An optical device of this construction used to generate interference fringes
from the GNU version of the Collaborative International Dictionary of English
- n. A prism whose refracting angle is very nearly 180 degrees.
- n. A combination of two short rectangular glass prisms cemented together at their diagonal faces so as to form a cube; -- called also optical cube. It is used in one form of photometer.
from The Century Dictionary and Cyclopedia
- n. A prism with two refractive edges each of small angle, its cross-section being an obtuse-angled isosceles triangle.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an optical device for obtaining interference fringes
In connexion with his study of the theory and phenomena of diffraction and interference he devised his double mirrors and biprism in order to obtain two sources of light independent of apertures or the edges of opaque obstacles.