Concave and Convex Lenses

作者：Dr Mark Fernihough, 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 Tangent Graph
Canonical form of a conics
Circumcenter
Lab 1, problem C

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3D 向量（三維）
餘弦
分佈
特殊點
二維向量

Concave and Convex Lenses

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