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Lesson 04 – Experiment: How Does Light Travel?

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Read The Experiment to Learn How Light Travels

How Does Light Travel?

Light travels in a straight line, and it travels fast—about 300 000 km/s. One way you can tell that light travels in a straight line is shadows. If you stand with your back to the Sun, your body will block the light. So the shadow you see in front of you is the space where no light is getting through. Here is another way to check that light travels in a straight line.

Now Show What You Know!

Complete some questions about the reading selection by clicking “Begin Questions” below.