Tag Archives: australia

Fresnel lens

The heating effect of 300 W focussed by the Fresnel lens is remarkable.Now this is HOT. A high quality Fresnel lens melts brick.
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Tektites

Tektites are debris thrown in to space from ancient meteorite impacts on Earth

A gigantic meteorite impact 800,000 years ago threw this impact melted rock into space where it rained back to Earth as Tektites. These Tektites were collected by my uncle in Australia deserts some 30 years ago.
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