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Physics 03
I'm back with another question:Situation: Mr Lim put a test tube into a boiling tube. Then he poured glycerine into the boiling tube. Yes, the glycerine filled up both the test tube and boiling tube. Guess what? the test tube 'disappeared' after the glycerine filled both tubes! Why is this so? Below are some explanations to the question. Explanation : We see edges of objects because light is either reflected or refracted at their boundaries. In case of clear objects, such as glass and some plastics, refraction allows us to discern them from the surrounding. Water and glass have different indices of refraction, which makes the light bend at the boundaries of the two material. This makes the sides of the submerged test tube visible when held under water. When a test tube is submerged under glycerine, however, will not be visible as glycerine and the Pyrex glass have the same index of refraction. Which means that, light is not refracted at all when it crosses boundary with the glycerine and the glass. Therefore, when Mr Lim submerged the test tube with glycerine, the test tube simply disappears (: Well, to summarise everything up, light was no reflected as both glycerine and test tube has the same index of refraction. reference: www.physicscentral.org/experiment/physicsquest/.../pq06-Extension4.pdf
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