Concave and Convex Lenses

作者：Ryan Smith, 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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four special lines and four centres
Hiperboliese_funksies_tabelmetode
Lol kill me
ijio
sin, cos and tan in a right angled triangle

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代數
梯形
平面
函數
線段

Concave and Convex Lenses

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