Definition of Prism

A transparent object with smooth and polished surfaces which refract the light is known as prism.

More About Prism

  • There are several types of prism but the traditional one is triangular prism.
  • The cross-section of the prism will be polygon. (Edges are straight).
  • Prism will not have curved surfaces.
  • A prism can be enclosed by any number of surfaces.
  • The sides of the prism are not parallel.
  • equilateral prism

  • The shape of the base (or cross section) gives the name of the prism.
  • Example: Triangular prism:

    1. A. Triangular prism is constructed with two triangular bases and three rectangular sides.
      B. The two place surfaces meet along an edge at a certain angle as shown in figure.
      C. The plane surfaces are called refracting surfaces.

    triangular prium

Refraction Through Prism

  • If a narrow beam of white light is passed through a prism, it splits into seven colours known as spectrum.
  • glass prisum

  • Red light is bent least by the prism. Violet light is deviated most by the same prism.

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