Tag Archives: fresnel lens

Fresnel Lens Popcorn

Fresnel lens focuses sunlight to make popcorn

A big Fresnel lens focuses sunlight to make popcorn.
“Continue reading” about the recipe for popping corn with sunlight.
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Fresnel lens

Now this is HOT. A high quality Fresnel lens melts brick.
“Continue reading” for details of this powerful “magnifying glass”.
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Crookes Radiometer

This is a Crookes Radiometer. An old physics department staple. What does it do? On exposure to light or heat, the vanes turn on a low friction mount. Here a green laser (14 mW green and 9 mW infrared) starts it turning.
“Continue reading” for more on this interesting science toy.
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