What is a light ray?


Quick Answer

A light ray is a basic element in geometrical optics. It is a hypothetical construct that, from any point in space, indicates the propagation of light. The concept that light travels in straight lines led to the development of the light ray concept.

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What is a light ray?
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Full Answer

In uniform mediums, light rays travel in a straight line. Light that is emitted from a small, localized source is represented by a collection of light rays that point radially outward from an idealized point source. A collection of parallel light rays, such as the light from a distant star and the light from a laser, is used to represent light flowing with uniform intensity through space.

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