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Materials Required
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* A lens or magnifying glass, bigger the better
* A newspaper sheet with lot of writing
* Sunny day
* A tray that will not burn easily
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Method
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- Go out on a sunny day and place the newspaper crumpled as a ball on the tray.
- Take the lens or magnifying glass and focus the sun over the newspaper ball.
- Adjust it by moving it up and down till you have a small focussed point on the newspaper ball. Be careful to not touch the newspaper as it will be hot and may even form a hole.
- Observe what happens and conclude.
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What is Learnt
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The magnifying glass focuses all the light from the sun on a tiny spot on the newspaper making it to turn hot and burn.
This is also the energy saving principle of solar cookers.
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Conclusion
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A magnifying glass or lens helps focussing all the light from one side to the other side and the newspaper starts burning until the whole newspaper ball is burnt.
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Flash Cards