Kōrero: 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.

Te whakamahi i tēnei tūemi

Te Ara - The Encyclopedia of New Zealand

This item has been provided for private study purposes (such as school projects, family and local history research) and any published reproduction (print or electronic) may infringe copyright law. It is the responsibility of the user of any material to obtain clearance from the copyright holder.

Ngā whakaahua me ngā rauemi katoa o tēnei kōrero

Te tuhi tohutoro mō tēnei whārangi:

Helen Beaglehole, 'Lighthouses - Lights: from oil to electricity', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/diagram/6675/fresnel-lens (accessed 30 September 2020)

He kōrero nā Helen Beaglehole, i tāngia i te 12 Jun 2006