Editing Headlamp (section)

==== Lens optics ====
A light source ([[Electrical filament|filament]] or arc) is placed at or near the focus of a reflector, which may be [[parabolic reflector|parabolic]] or of non-parabolic complex shape. [[Fresnel lens|Fresnel]] and [[prism (optics)|prism]] optics moulded into the headlamp lens [[Refraction|refract]] (shift) parts of the light laterally and vertically to provide the required light distribution pattern. Most sealed-beam headlamps have lens optics.<ref name="OpticSystems">{{cite web |url=http://dastern.torque.net/techdocs/Archives/Hella_Systems/hella_headlamp_systems.htm |title=Headlamp Optical Systems Illustrated, Explained & Compared |website=Webcitation.org |access-date=2012-01-31 |url-status=dead |archive-url=https://web.archive.org/web/20180510130306/http://dastern.torque.net/techdocs/Archives/Hella_Systems/hella_headlamp_systems.htm |archive-date=10 May 2018}}</ref>
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