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File:Lens Radii Sign Conventions.png

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English: Figure illustrates use of positive & negative curvatures for the surfaces of a lens.

Think of the principle axis as being a real number line, with the mid-plane marking the origin of the axis. Light rays travel in the positive direction.

IF the center of curvature – for either surface – lies in the negative region, then the curvature is negative, R < 0.

IF the center of curvature – for either surface – lies in the positive region, then the curvature is positive, R > 0.
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Author Erik LongLeaf

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18 April 2013

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current04:11, 18 April 2013Thumbnail for version as of 04:11, 18 April 2013600 × 652 (64 KB)Eirk LongLeafUser created page with UploadWizard

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