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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]].

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]].

Ray optics was thought of by Greeks a long time ago in a simpler form. It was thought that rays of light emanated from the eyes and out into the world. This is false, but the concept of rays has carried through.

Ray optics was thought of by Greeks a long time ago in a simpler form. It was thought by some that rays of light emanated from the eyes and out into the world. This is false, but the concept of rays has carried through.