Ray optics

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Ray optics (also known as geometrical optics) is a method of the study of optics where light is represented as straight lines known as rays. In reality, light is more wavy, but approximating it as straight lines makes calculation and computation much more efficient.

There are some things that ray optics is not sufficient for, for example sub-wavesize structures and simulation. Also ray optics does not take into account diffraction.

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