This is a cool trick you can do if you have Pyrex glassware and oil at home! They have similar refra
This is a cool trick you can do if you have Pyrex glassware and oil at home! They have similar refractive indexes, so when they’re all together you can’t see any sort of bending of light at the edges. Here you can see the tube because it’s filled with air, but once the oil floods in its all the same index and you can’t see it. Science! -- source link
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