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.
- The shape of the base (or cross section) gives the name of the prism.
- Example: Triangular prism:
- 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.
Refraction Through Prism
- If a narrow beam of white light is passed through a prism, it splits into seven colours known as spectrum.
- Red light is bent least by the prism. Violet light is deviated most by the same prism.