The Fresnel Lens
View The Fresnel Lens
Presenter: Jonathan Hare
Published: December 2013
Age: 14-19 and upwards
Views: 1780 views
Tags: fresnel,lens,light,beam,bend
Type: Lectures
Source/institution: University of Sussex
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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 modern lighthouse. This film looks at why they were invented and how they work including details of a working lighthouse in France.
