Siya placed a coin at the bottom of a glass tumbler containing water. When she tilt the jar suitably. When viewed at a suitable angle, the coin appears to be floating.
Why the coin appears to be floating when viewed at a certain angle?
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Because the speed if light changes when the light travels from rarer to denser medium(water) and there will be bending of light rays at the interface. So it appears that the depth where coin is will increase and appears to be floating.
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