Object image and focal distance relationship (proof of formula) | Physics | Khan Academy
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Thin lens equation and problem solving | Geometric optics | Physics | Khan Academy
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Derivation of the mirror equation | Geometric optics | Physics | Khan Academy
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How Optics Work - the basics of cameras, lenses and telescopes
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Standing waves on strings | Physics | Khan Academy
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Magnification formula for mirrors
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Refraction and Snell's law | Geometric optics | Physics | Khan Academy
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Tensors Explained Intuitively: Covariant, Contravariant, Rank
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