refraction
/rɪˈfræk·ʃən/ n [U] physicsDefinition
absolute index of refraction › The absolute index of refraction is a calculation of the relationship between the speed of light moving through a medium (= substance) and the speed of light in a vacuum (= place with no matter in it) angle of refraction › The angle of refraction is the angle that a beam of light or other energy that is refracted by a surface makes with a line vertical to that surface.
(Definition of refraction n from the Cambridge Academic Content Dictionary
© Cambridge University Press)
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