What are those rays that come out of headlights at night?
In: 4
If you mean the rays that come out as a cross (4 rays, up left right down):
Our eyes, as well as cameras, use lens and apertures (holes that change size, pupils in the eyes) to focus on what we want to see. The shape of the aperture causes some side effects to the light. The particular shape of our eyes causes crosses. You may have seen in movie shots that show the glare of the sun, and have hexagon-like glare? That is caused by the shape of the aperture of the camera, too.
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