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published by the Designmate
This eight-minute video explains the principles of convex lenses by blending video, animation, and still images. It segments the convex lens into pieces, much like one sees in an optical bench -- triangular prisms at top and bottom, trapezoidal prisms adjacent, and a rectangular prism in the precise middle. Animated ray diagrams show clearly how light refracts at both edges of the convex lens, and bend toward the principal axis. The animation depicts 3 fundamental actions of convex lenses: 1) A ray traveling parallel to the principal axis passes through the principal focus, 2) A ray traveling through the focus will emerge parallel to the principal axis, and 3) A ray traveling through the optical center will emerge undeviated.
Please note that this resource requires Flash.
Editor's Note: Designmate is a designer of eContent for K-12 education specializing in 3D and animation to simplify concepts. This particular video is one of a small collection offered for free download. Designmate has been the recipient of multiple awards, including the World Summit Award, Worlddidac Award for eLearning, and winner of CSR (Best Corporate Social Responsibility Practice).
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