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fresnel 1822 beam catadioptric shape prismatic internal reflection refraction source visible design aperture short focal length dramatic detail concentric prism turquoise lighthouse lamp maine museum brilliant stacked reflect reflective refractBefore The Light Comes On - Fresnel Lens Detail Editorial Image
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Before the light comes on - Fresnel lens detail #316974276
Description
In 1822 French civil engineer Augustin-Jean Fresnel invented a new type of lens that created a much stronger light beam. The catadioptric lens shape has outer prismatic elements that use internal reflection as well as refraction to capture more light from the light source and add it to the beam, making it visible at great distances. Fresnel's design produces large aperture, short focal length lenses without the added mass and volume needed by conventional lens design
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