Library
Every sandbox
Filter by domain, search, or sort. The domains are just a way in — nothing here is locked or ranked.
Astigmatism & the Conoid of Sturm
Two focal lines, the interval of Sturm, and the circle of least confusion.
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Multiple Lens Systems
Build a system of up to three lenses and trace the image through each one.
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Prisms & Prentice's Rule
Decentre a ray through a lens and watch the induced prism and its base.
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Thin Lenses & Image Formation
Drag the object, lens, and screen. Watch the image form, grow, and flip.
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Vergence & Reduced Vergence
Step a wavefront through surfaces and watch vergence jump at each one.
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soonSchematic Eye Models
Switch between the reduced eye, Gullstrand, and Liou–Brennan.