Transcription of Fresnel Lenses Brochure
{{id}} {{{paragraph}}}
Example: dental hygienist
Fresnel Lenses Brochure
Positive Focal Length Fresnel lens Used as a CollectorPositive Focal Length Fresnel lens Used as a CollimatorNegative Focal Length Fresnel lens Used as a Diverger HIGH QUALITY Fresnel Lenses IN A VARIETY OF SIZES & FOCAL LENGTHS Copyright Fresnel Technologies, Inc. 1996-2014 2 The Fresnel lens Centuries ago, it was recognized that the contour of therefracting surface of a conventional lens defines its focusingproperties. The bulk of material between the refracting sur-faces has no effect (other than increasing absorption losses)on the optical properties of the lens . In a Fresnel (pointfocus) lens the bulk of material has been reduced by theextraction of a set of coaxial annular cylinders of material, asshown in Figure 1. (Positive focal length Fresnel Lenses arealmost universally plano-convex.) The contour of the curvedsurface is thus approximated by right circular cylindricalportions, which do not contribute to the lens optical proper-ties, intersected by conical portions called grooves.
Positive Focal Length Fresnel Lens Used as a Collector Positive Focal Length Fresnel Lens Used as a Collimator Negative Focal Length Fresnel Lens Used as a Diverger
Loading..
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: