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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