The correct spelling of the term "angle of deviation" is ˈæŋɡəl əv diːviˈeɪʃən. The symbol /ˈæŋɡ/ represents the sound "ang," pronounced as in the word "bang." The /əl/ symbol represents the "ul" sound, as in the word "pull." The /diːv/ symbol represents the sound "div," as in the word "diverse." The /eɪʃ/ symbol represents the "aysh" sound, similar to the word "ash." Therefore, the spelling of "angle of deviation" accurately reflects the phonetic sounds used in its pronunciation.
The angle of deviation refers to the angular difference between the incident ray - the ray of light that strikes a transparent medium - and the refracted ray - the ray of light that travels through and emerges from the medium. This optical phenomenon occurs when light undergoes refraction at the boundary between two different media, such as air and glass, due to the change in its speed and direction.
The angle of deviation is measured by determining the separation between the incident ray and the emergent ray. It is typically calculated by subtracting the angle of incidence from the angle of refraction. The angle of incidence is the angle between the incident ray and the normal - a line that is perpendicular to the surface of the medium at the point of incidence. The angle of refraction, on the other hand, is the angle between the refracted ray and the normal.
The angle of deviation plays a crucial role in understanding the behavior of light as it passes through different media, as it is responsible for phenomena like dispersion and the formation of rainbows. It is also important in determining the refractive index of a given medium, which quantifies how much the medium bends light. As different media have different refractive indices, the calculated angle of deviation enables scientists and engineers to design and analyze optical devices such as lenses, prisms, and mirrors.
A. of refraction.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.