FRESNEL LANTERN Meaning and
Definition
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A fresnel lantern is a type of lighting instrument commonly used in the entertainment industry, particularly in theater and film production. It is named after its design, which incorporates a fresnel lens to produce a desired lighting effect.
The fresnel lens is a specialized optical component that consists of a series of concentric, stepped ridges on one side and a smooth curved surface on the other. This unique construction allows the lens to focus and control the dispersion of light, resulting in a soft, diffused beam with a wide spread. The lens can also be easily adjusted to change the size and shape of the beam by moving it closer or further away from the light source.
The fresnel lantern itself typically consists of a metal housing that holds the light source, such as an incandescent bulb or an LED panel, and the fresnel lens in front of it. The housing may also include various mechanisms for controlling the output, such as shutters or barn doors, which allow for precise shaping of the light beam.
Fresnel lanterns are known for their versatility and efficiency. They can produce a range of lighting effects, from a focused spotlight to a broad wash of light, making them ideal for illuminating stages and sets. Their compact design and light weight make them easy to handle and position, making them a popular choice in the production industry.
Etymology of FRESNEL LANTERN
The word "fresnel lantern" derives its name from the French physicist Augustin-Jean Fresnel, who significantly contributed to the development of optics during the 19th century. The "lantern" component of the term refers to a light source or device that produces light, often enclosed in a protective housing.
The Fresnel lens, invented by Augustin-Jean Fresnel, is a distinctive type of lens used in many lighting applications. It is composed of concentric rings or steps that allow the lens to be much thinner and lighter than traditional lenses while maintaining efficient light-gathering properties. The use of Fresnel lenses in lanterns, particularly in theatre and stage lighting, led to the term "Fresnel lantern" to describe these specific lighting fixtures.
