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The subfield of optics in which light propagation is approximated in terms of rays. It mainly includes reflection and refraction on surfaces.

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In phase contrast microscopy, how does the phase difference between the diffracted light and...

Phase contrast microscopy works by exploiting the phase difference between two paths of light which pass through a probe point of a specimen: One path, the "background" path, is the path the light th …
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In phase contrast microscopy, how does the phase difference between the diffracted light and...

The Wikipedia Article - in its present form(11. of April 2020) is false: The annulus is not point focussed on the sample (object) plane, but illuminates it diffusely. See here for the correct optical …
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