fresnel lens :

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fresnel lens

  • n  lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length
News & Articles

  • Lighthouse power problem fixed
    The town of York says the power problem that plagued Nubble Lighthouse has been fixed. The electrical problem arose earlier this year, and the challenge was fixing the lighthouse while maintaining its historic integrity. Nubble remains one of only a handful of Maine lighthouses still using the famous Fresnel lens. The electrical fix comes just in time. The lighthouse will be illuminated during ...
    July 26, 2013 - WMTW Portland

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