Story: Lighthouses

Fresnel lens

Fresnel lens

Fresnel lenses were used in lighthouses to maximise the amount of light emitted. This diagram shows how a light source hits the lens, which has different shaped prisms to refract the light and direct it forwards.

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Te Ara - The Encyclopedia of New Zealand

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How to cite this page:

Helen Beaglehole, 'Lighthouses - Lights: from oil to electricity', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/en/diagram/6675/fresnel-lens (accessed 20 May 2022)

Story by Helen Beaglehole, published 12 Jun 2006