Fresnel Lens

In a lighthouse the Fresnel lens is wrapped around the lamp concentrating the light rays into a powerful and parallel beam, which can be seen with a naked eye as far away as 20 miles. I took this when I visit the Kinnaird Head Lighthouse Scotland.

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10 thoughts on “Fresnel Lens

  1. Very neat shot. They’re a real example of masterly glass making, and beautiful.
    I stood in front of a Fresnel lens like this, in Maine, and a former lighthouse keeper held up a little electric candlestick, I don’t think the bulb was more than 8 or 10 watts at most, but the lens concentrated the light so that you could not look directly at it. Amazing.

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