Fresnel lens
by Mary Almond
Title
Fresnel lens
Artist
Mary Almond
Medium
Photograph - Digital Art, Photography
Description
Inside the Fresnel lens of the Currituck Beach Lighthouse
A 1000-watt bulb flashes a beam every 20 seconds, and can been seen for 18 nautical miles. One bulb is always kept in reserve as backup, just in case something happens to the working one.
Uploaded
February 28th, 2013
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