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White Light Through a Glass Prism
Age 13 · Physics
A narrow white beam enters a clear triangular glass prism from the left. Inside the glass it bends, and when it leaves, the beam spreads into a fan of colours from red to violet.
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Age 13: open this week
Browse Age 13
In the picture
- Incoming white beam: the narrow ray before it enters the glass
- Glass prism: the triangular block that bends the light
- Red edge ray: the colour bent least, leaving near the top
- Violet edge ray: the colour bent most, leaving near the bottom
Examples
- A drinking straw looks bent in a glass of water.
- A rainbow forms when sunlight passes through raindrops.
Key takeaways
- White light is a mix of colours.
- Glass bends violet more than red, so the colours separate.
Quiz: White Light Through a Glass Prism (Age 13)
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What is white light made of?
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When white light passes through a glass prism, what happens to the colours?
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Which colour does a glass prism bend the most?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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