What will happen if you put oil on the coin instead of water, and then put the glass tumbler filled with water on it? *will it get invisible
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When the cup is filled with water, the penny disappears. This happens because of refraction. When light bounces off of an object, it reaches our eyes and we see the object. As light travels through the sides of the glass and the water, it's refracted and never reaches our eyes, which makes the penny seems to disappear
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