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Because Glycerol and glass have the same refractive index. ie light is bent (refracted) by the same amount when the light travels from air to either the glass or the glycerol. Therefore when combined together you will only see the exterior substance (in this case glycerol) not what is hidden inside it.

I believe there is a similar affect with diamonds in immersed in water ie. they disappear. This is also apparently a good way to check if a diamond is real.

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13y ago

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