Lighthouse lantern: transparent-side box enclosing a light.
Dioptric ring: ring that refracts light.
Catadioptric ring: ring that reflects and refracts light.
Lens clock: apparatus that turns the light.
Bullseye: central device that converges and diverges light rays.
Framework: metal housing holding different parts of the lantern.

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An aid for navigation and pilot at sea, a lighthouse is a tower building or framework sending out light from a system of lamps and lenses. Lighthouses are used to mark dangerous coastlines, hazardous shoals, safe entries to harbors and can also assist in aerial navigation. Because of modern electronic navigational aids, the number of operational lighthouses has declined.

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