geometrical optics

noun
the branch of optics dealing with light as rays, especially in the study of the effects of lenses and mirrors on light beams and of their combination in optical instruments.

Origin:
1830–40

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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In the case of vegetation, geometrical optics is used since the leaf size is typically larger than the wavelength.
The camera presents an excellent way to illustrate principles of geometrical optics.
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