how is light house works?
Answers
A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses and to serve as a navigational aid for maritime pilots at sea or on inland waterways.
Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks and safe entries to harbors; they also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and use of electronic navigational systems.
Lighthouses use a special type of lens called Fresnel lens. In a lighthouse, the Fresnel lens wrapped around the lamp concentrates the light rays into a parallel beam so people can see it.
Thereby it serves as a navigational aid for sailors at sea or on inland waterways.
