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#1 (permalink)

05-16-2009, 03:05 AM

Alread glasses Alread glasses is offline

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Join Date: May 2009

Posts: 47

Aspherical lens

This lens from the lens center to the periphery, gradually increase the radius of curvature (flat lens gradually the surface). Refraction lens surface, according to the selected arc-based calculation of sound close to the ideal of non-spherical curve. Curve close to its non-spherical or elliptical parabolic surface. The incident light parallel to the lens, whether far or near-axis light ray axis can be converged to one point.

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