| 单词 | prism |
| 释义 | prism (once / 2189 pages) n In geometry, a prism is a three-dimensional shape that has two bases that are parallel and the same size and shape. The prism's sides are all parallelograms. A classic pup tent is a triangular prism. In optics, a prism is a piece of glass, quartz, plastic, or other material that can be used to refract light. A typical prism is triangular in shape, and when white light (like sunlight) is shown through it, the prism breaks the light into separate colors and displays it as a rainbow (color spectrum). Sir Isaac Newton experimented with prisms in the 1600s, and his work was the beginning of the modern period of both optics and the understanding of light. WORD FAMILYprism: prismatic, prismoid, prisms+/prismatic: prismatically/prismoid: prismoids USAGE EXAMPLESHe also became a reader, which led him to view his incarceration through a political and economic prism. Los Angeles Times(Dec 14, 2016) “Any retaliatory measures were seen through the prism of what would happen on Election Day.” New York Times(Dec 13, 2016) But cinema is better at exploring than explaining, and the screen is more like a prism or a kaleidoscope than a mirror or a window. New York Times(Dec 07, 2016) 1n a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms Hypo|Hyper parallelepiped, parallelepipedon, parallelopiped, parallelopipedon a prism whose bases are parallelograms quadrangular prisma prism whose bases are quadrangles triangular prisma prism whose bases are triangles cuboida rectangular parallelepiped rhombohedrona parallelepiped bounded by six similar faces (either rhombuses or parallelograms) polyhedron a solid figure bounded by plane polygons or faces 2n optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image Syn|Hypo|Hyper optical prism erecting prism a right-angled optical prism used to turn an inverted image upright optical device a device for producing or controlling light |
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