Which Liquid Requires More Volume to Conceal a Coin: Oil or Water?

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To conceal a coin under a beaker with a foil lid, the volume of liquid required depends on the refractive index of the liquid. When comparing oil and water, oil requires a greater volume to achieve the same effect of making the coin disappear. This is due to the way light refracts when transitioning from air to the liquid, with oil having a lower refractive index than water. As light crosses into oil, it diverges more from the normal line, making the coin less visible. Therefore, for the same color of light, oil necessitates a larger volume than water to conceal the coin effectively.
jakey
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Question on total reflection...if you were to conceal a coin, by putting it under a beaker whose lid is covered with foil, and you slowly add a liquid until the coin seemingly disappears, which would require a greater volume? oil or water?
 
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Do you mean a coin in dip of a pool? If it is, answer is oil for the same color of light. When light cross to air(minor indice) will far a way from normal. Thus come closer to distinctive surface. Much flux of indice, much far a way from normal.
 

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