Cylindrical aberration: Wooden model.

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(E)Optics - E+30: Lenses

Cylindrical aberration: Wooden model. The shaded triangle can slide back and forth to depict a difference in focal lengths for light rays travelling along two perpendicular axes.
UCB Index: 
E+30+40
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E+30+35 Pincushion and barrel distortion of lenses using arc lamp.
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E+30+45 Astronomical telescope: Using objective and eyepiece lenses.