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White light through a prism
Age 13 · Science
White light is a mixture of many colours. When it passes through a glass prism, each colour bends by a slightly different amount, so the colours spread out into a rainbow.
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Age 13: open this week
Browse Age 13
In the picture
- The white beam: one narrow stream of mixed light before the prism
- The glass prism: light slows and bends as it crosses the glass
- The fan of colour: each colour bends by a different amount and leaves at its own angle
- The rainbow stripe: the separated colours landing on the white card
Examples
- A rainbow in the sky after rain, where water droplets bend sunlight
- A glass of water on a sunny windowsill throwing a small rainbow onto the wall
Key takeaways
- Each colour of light bends by a different amount when it passes from air into glass
- A prism separates white light into red, orange, yellow, green, blue and violet
Quiz: White light through a prism (Age 13)
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What is white light, according to the card?
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Why does white light spread into a rainbow when it passes through a prism?
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Which colours does the card say a prism separates white light into?
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