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[Phy] refractive index experiment

refractive index experiment

procedure:
1. measure the height of  bucket and evenly spaced it into 5 different heights
2. fill the bucket with water
3. put a coin into the bucket
4. move a coin up and down beside the bucket ( in air) until the coins are about the same size
5. measure the height between the coin (in air) and the surface of water
my question is
as i plot the graph as the height of water against the height of coin, why the slope is equal  to  the  refractive index of water?



   

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