Sun May 22, 2011 By: Joseph George

a coin kept in a vessel and not visible when seen from just below the edge of the vessel can be viewed from the same position when water is poured into the vessel.

Expert Reply
Sat May 21, 2011
This is  because of the apparent dept of the coin. when water is put in the vessel, then the coin appears to be coming up but actually it doesn't come up, it is all because when the ray comes out from the coin towards our eyes, the ray bends away from the normal and it reaches our eyes. Then the ray is forwarded towards the water and where the two ray meets , it forms a apparent dept of the coin.
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