Question

A cuboidal tank of depth $8$ metres is full of water $\mu =\frac{4}{3}$. The bottom is seen at a depth of ___ metres.

• A. 2
• B. 3
• C. 6
• D. 12

Answer 1

The correct option is C 6

Given:
Depth of tank, $h=8m$
Refractive index, $\mu =\frac{4}{3}$
Let the apparent depth be $h^{\prime }$
The refractive index of a medium
$\Rightarrow \frac{\text{Real depth}}{\text{Apparent depth}}$.
$\Rightarrow \mu =\frac{h}{h^{\prime }}$
$\Rightarrow h^{\prime }=\frac{8}{4/3}=6m$