Fresnel lens – Lighthouses – Te Ara Encyclopedia of New Zealand

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.

Lighthouses – Te Ara Encyclopedia of New Zealand

The missing lens of the Napier Lighthouse

Welcome to Heritage New Zealand

Lighthouses – Te Ara Encyclopedia of New Zealand

The Science and History behind the Fresnel Lighthouse Lens

The Science and History behind the Fresnel Lighthouse Lens

Lighthouses of New Zealand: South Island

Fresnel lighthouse lens hi-res stock photography and images - Alamy

Lenses – Lighthouses – Te Ara Encyclopedia of New Zealand

Dog Island Lighthouse - Wikipedia

Lighthouses of New Zealand: South Island

The Fresnel Lens ~ Boating NZ

Fresnel Lens - Clio