Integer (computer science) In computer science, an integer is a datum of integral data type, a data type that represents some finite subset of the mathematical integers. Integral data types may be of different sizes and may or may not be allowed to contain negative values. Integers are commonly represented in a computer as a group of binary digits (bits).
critical angle. Definition: The angle or greater, measured at the interface between a denser medium and a less dense in the same plane as the incident light, at which total internal reflection takes place - i.e. light is reflected back into the medium.
This particular angle of incidence is called the critical angle, . For, there is no refracted ray. Instead, all of the light incident on the interface is reflected--see Fig. 59. This effect is called total internal reflection, and occurs whenever the angle of incidence exceeds the critical angle.