PETER BOWATER / SCIENCE PHOTO LIBRARY PETER BOWATER / SCIENCE PHOTO LIBRARY
Lighthouse. Composite image of a lighthouse on a rocky cliff at night, sending out a beam of light to warn shipping of the dangerous coastline. The beam comes from a rotating light source, usually a parabolic reflector that focuses the light into a beam. The rotation sends the beam sweeping across the sea. This means that the lighthouse is seen by ships as a flashing light.
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