A mark at the bottom of a liquid appears to rise by `0.1m`. The depth of the liquid is `1m`. The refractive index of the liquid is

Options

A. `1.33`
B. `(9)/(10)`
C. `(10)/(9)`
D. `1.5`

Answer

C

Explanation

Real depth `=1m`
Apparent depth `=1-0.1=0.9 m`
Refractive index `mu=("Real depth")/("Apparent depth")=(1)/(0.9)=(10)/(9)`