The Probert Encyclopaedia of Science & Technology

PRISM

A prism is a solid figure that is essentially triangular in shape and made of a transparent material. They are used in physics to deviate or disperse a ray in optical instruments or laboratory experiments. If a narrow beam of white light is passed through a prism it is split into a range of colours. The light is split because each of the colours is refracted by a different amount, because each is light of a different wavelength.
Research Prism