index of refraction of liquid = index of refraction of containerpic.twitter.com/PPZFM7bLdP
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Replying to @InertialObservr
I start with a full beaker and ask students to predict what happens when I submerge the little one. When I do it, I can't get it in because something blocks it. I pull out *another* little beaker that had been submerged the entire time, invisible to the class.
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