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Wherein Weasel channels Mr Wizard


Illustration pinched from this fun introduction to optical microscopy

Refractive index is a measure of how much light is bent — or, to put it another way, slowed down — by a transparent or translucent material. Light moves through water 1.33 times slower than it does through a vacuum, so the refractive index of water is 1.33.

Oh, half y’all are physics geeks. You know this. I only know it because when I was a kid I thought I could invent an iridescent surface by combining painting materials with greatly different refractive indices. A thin layer of something on top of a thick layer of something with a very different RI will make a rainbow. Soap bubbles. Motor oil in a water puddle.

I failed, but let’s not dwell on that.

All this is by way of introduction to this cool video I ran across this evening. Because they have identical refractive indices, this is what happens when you dip a borosilicate rod (i.e. what Pyrex used to be before they changed the formula) into a beaker of cooking oil or glycerin.

I feel terribly, terribly cheated that real scientists don’t sit around doing this kind of shit all day.

sock it to me

February 1, 2016 — 10:12 pm
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