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prism    音标拼音: [pr'ɪzəm]
n. 棱镜,棱柱

棱镜,棱柱

prism
n 1: a polyhedron with two congruent and parallel faces (the
bases) and whose lateral faces are parallelograms
2: optical device having a triangular shape and made of glass or
quartz; used to deviate a beam or invert an image [synonym:
{prism}, {optical prism}]

Prism \Prism\ (pr[i^]z'm), n. [L. prisma, Gr. pri`sma, fr.
pri`zein, pri`ein, to saw: cf. F. prisme.]
1. (Geom.) A solid whose bases or ends are any similar,
equal, and parallel plane figures, and whose sides are
parallelograms.
[1913 Webster]

Note: Prisms of different forms are often named from the
figure of their bases; as, a triangular prism, a
quadrangular prism, a rhombic prism, etc.
[1913 Webster]

2. (Opt.) A transparent body, with usually three rectangular
plane faces or sides, and two equal and parallel
triangular ends or bases; -- used in experiments on
refraction, dispersion, etc.
[1913 Webster]

3. (Crystallog.) A form the planes of which are parallel to
the vertical axis. See {Form}, n., 13.
[1913 Webster]

{Achromatic prism} (Opt.), a prism composed usually of two
prisms of different transparent substances which have
unequal dispersive powers, as two different kinds of
glass, especially flint glass and crown glass, the
difference of dispersive power being compensated by giving
them different refracting angles, so that, when placed
together so as to have opposite relative positions, a ray
of light passed through them is refracted or bent into a
new position, but is free from color.

{Nicol's prism}, {Nicol prism}. [So called from Wm. Nicol, of
Edinburgh, who first proposed it.] (Opt.) An instrument
for experiments in polarization, consisting of a rhomb of
Iceland spar, which has been bisected obliquely at a
certain angle, and the two parts again joined with
transparent cement, so that the ordinary image produced by
double refraction is thrown out of the field by total
reflection from the internal cemented surface, and the
extraordinary, or polarized, image alone is transmitted.
[1913 Webster] Prismatic

27 Moby Thesaurus words for "prism":
achromatic lens, astigmatic lens, burning glass, camera,
coated lens, concave lens, concavo-convex lens, condenser,
convex lens, eyeglass, eyepiece, glass, hand lens, lens, magnifier,
magnifying glass, meniscus, object glass, objective,
objective prism, ocular, reader, reading glass, telephoto lens,
toric lens, varifocal lens, zoom lens



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