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The Roundtable / Re: Titanic tourist sub goes missing
« Last post by zxcvbob on Today at 07:08:31 PM »
A "puree" marble in a glass of water... why, it's almost invisible exept for the studio lights reflecting off it!
Terry, 230RN
If that were a glass of glycerin instead of water, there would be no reflections at the boundary. They have the same refractive index :)