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Hare Fresnel 00:05:00

The Fresnel Lens

by Jonathan Hare
The Fresnel Lens
for 14-19 and upwards,
Lectures | 14-19 and upwards | 5 years ago | 785 views
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Early lighthouses used coil and wood fires before moving on to gas and then electricity powered lights.  Massive improvements took place by using a lens system around the light.  The development of the Fresnel lens brought what we now regard as the....

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