File:Fresnel lens focal length.png

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Fresnel_lens_focal_length.png (415 × 226 pixels, file size: 37 KB, MIME type: image/png)

A Fresnel lens focal length (f) and diameter is (φ). (Image: Davis and Kühnlenz, 2007)

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	13:53, 31 October 2017		415 × 226 (37 KB)	Paulo Pacheco (talk \| contribs)

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