Question

a coin at the bottom of a trough containing water at a depth of 15cm appears to be 3.75cm raised above from the bottom. calculate the refractive index of water.

Answer 1

The refractive index of water is 1.33
You get this in the following way
real depth=15cm
the depth as seen by the observer=15 - 3.75 = 11.25
now refractive index= real depth/apparent depth
= 15/11.25
=1.33

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Answer 2

Answer:

Virtual Depth of the coin is (15 − 3.75) = 11.25cm

Refractive index = virtual depth / real depth

= 15 / 11.25 = 1.33

The refractive index of water is 1.33