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the Physics Education Technology Project
This interactive Flash application allows students to investigate the properties of converging lenses. The user can change the index of refraction and the radius of curvature of the lens. The lens and object can be moved in two dimensions. The user has the option of displaying various rays including rays from two points on the object.
This is part of a large collection of simulations freely available from the Physics Education Technology group at the University of Colorado.
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