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Chapter 31: Diffraction and Interference Vocabulary
Diffraction and Interference Vocabulary
9
Physics
11th Grade
07/20/2012

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Term
Huygens' principle
Definition
Every point on any wave front can be regarded as a new point source of secondary waves.
Term
diffraction
Definition
The bending of a wave around a barrier, such as an obstacle or the edges of an opening.
Term
monochromatic
Definition
Having a single color or frequency.
Term
diffraction grating
Definition
A series of closely spaced parallel slits or grooves that are used to separate colors of light by interference.
Term
iridescence
Definition
The phenomenon where by interference of light waves of mixed frequencies reflected from the top and bottom of thin films produces a spectrum of colors.
Term
incoherent
Definition
As applied to light waves, having a jumbled mixture of frequency, phase, and possibly direction.
Term
coherent
Definition
As applied to light waves, having identical frequency and identical phase, and traveling in the same direction. Lasers produce coherent light.
Term
laser
Definition
An optical instrument that produces a beam of coherent light-that is, having the waves all the same frequency, phase, and direction.
Term
hologram
Definition
A three-dimensional version of a photograph produced by interference patterns of laser beams.
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