In optics, a (usually) triangular block of transparent material (plastic, glass, or silica) commonly used to bend a ray of light or split a light beam (for example, white light) into its component colours. Prisms are used as mirrors to define the optical path in binoculars, camera viewfinders, and periscopes. The dispersive property of prisms is used in the spectroscope.
White symbolizes justice and the promise of the future. Blue stands for prosperity. Red represents unity and purpose and the blood shed during the struggle for freedom. Effective date: 4 December 1975.