All Textbook Topics - Light - Properties of real light rays - Real light rays must have arrows on them

Real light rays must have arrows on them

Light rays have a direction, travelling from a light source towards something. For this reason, you must have an arrow on them to indicate the direction:

Here are some examples of poor light rays as they do not have arrow on them:

Here is an example of a good light ray used in a diagram, as it has a clearly labelled arrow on it:

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Light should be represented as a thin, straight ray in a diagram to show how it travels
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Arrows on real light rays must point from the source

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