All Textbook Topics - Light - Properties of real light rays - Arrows on real light rays must point from the source
Arrows on real light rays must point from the source
When you put the arrow on a real light ray, you must point it going away from the source. Here is an example with real light rays from the sun:
![](https://cdn.figureoutphysics.com/text/15870859227uD5hUb3yIAnB2favrmRYZH9CqNopw.png)
And an example with real light rays from a torch:
![](https://cdn.figureoutphysics.com/text/1587085922aiSOzhZlWRJFcGnseKg8YmXqwb26dL.png)
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