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• 11:02, 25 April 2022 Physdemo talk contribs created page Disappearing Test Tube (Created page with "{{NewDemo|subject=Light and Optics|topic=Refraction and Dispersion|file1=Disappearing.JPG}} Mineral oil and the material the test tube is made out of have a very similar index of refraction. When the test tube is placed in the mineral oil, as the oil fills the test tube, the tube "disappears." The demonstration usually used with this set-up is as follows: A test tube is placed in the mineral oil before the lecture. During the lecture, the lecturer smashes another test t...")