Plural of fresnel; multiple lenses with concentric grooves used for directing and focusing light in various applications.
Plural formation of 'fresnel,' following regular English pluralization. As the technology became widely used in theatres and photography, the plural form became standard in technical vocabularies.
When you see bright lights on a theater stage creating those distinct patterns, you're probably looking at fresnels at work—they're essential to modern performance lighting and cinematography!
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