Question

The depth of water in a bucket is 40 cm but its bottom appears to be raised by 10 cm. What is the refractive index of water ?

Answer 1

The real depth of water in bucket is 40 cm

The apparent depth of water in bucket is 40 - 10 = 30 cm

$refractiveindex=\frac{actualdepth}{apparentdepth}$

$refractiveindex=\frac{d_{actual}}{d_{apparent}}=\frac{40}{30}=\frac{4}{3}\mu =\frac{4}{3}$