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Vegetable oil makes Pyrex glass disappear because both bend light the same way, sharing a refractive index of 1.47.

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Science girl

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Vegetable oil makes Pyrex glass disappear because both materials bend light in the same way, with a refractive index of 1.47.
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Vegetable oil makes Pyrex glass disappear because both materials bend light in the same way, with a refractive index of 1.47.

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Fresnel reflection coefficient: R = |(n₁ − n₂)/(n₁ + n₂)|² Pyrex rod (n≈1.474) dropped into glycerin (n≈1.473). Instantly R collapses to zero. No reflection. No interface. The glass simply ceases to exist optically—light passes straight through as if the boundary was never there. Not magic. Not editing. Just Maxwell’s equations enforcing perfect index match. This is why immersion oil, AR coatings, and optical fibers work.
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Fresnel reflection coefficient: R = |(n₁ − n₂)/(n₁ + n₂)|² Pyrex rod (n≈1.474) dropped into glycerin (n≈1.473). Instantly R collapses to zero. No reflection. No interface. The glass simply ceases to exist optically—light passes straight through as if the boundary was never there. Not magic. Not editing. Just Maxwell’s equations enforcing perfect index match. This is why immersion oil, AR coatings, and optical fibers work.

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