Copy of Concave and Convex Lenses

Author:raffishirinian, Tom Walsh

Move the tip of the "Object" arrow to move the object. Move the point named " Focus' " to change the focal length. Move the point named " Focus' " to the right side of the lens to change to a concave lens.

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The Gardener's Ellipse
Regular Star Polygons
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Centroid or Barycenter
Linear Equations
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