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deflection. n. 1. the act of deflecting or the state of being deflected. 2. the amount of deviation. 3. (General Physics) the change in direction of a light beam as it crosses a boundary between two media with different refractive indexes.
Definition of DIFFRACTION. : a modification which light undergoes especially in passing by the edges of opaque bodies or through narrow openings and in which the rays appear to be deflected; also: a similar modification of other waves (as sound waves) or of moving particles (as electrons).See diffraction defined for kids. ADVERTISEMENT. a modification which light undergoes especially in passing by the edges of opaque bodies or through narrow openings and in which the rays appear to be deflected; also: a similar modification of other waves (as sound waves) or of moving particles (as electrons). See diffraction defined for kids.