Question

A rectangular tank of depth 8 m, is full of water $(\mu =\frac{4}{3})$. The bottom would be seen at the depth of

• A. $6\text{m}$
• B. $\frac{8}{3}\text{m}$
• C. $8\text{m}$
• D. $10\text{m}$

Answer 1

The correct option is A $6\text{m}$

Given:
The refractive index of water = $\frac{4}{3}$
The real depth of the tank = $8\text{m}$

Refractive index, $\mu =\frac{\text{Real depth}}{\text{Apparent depth}}$

$⟹\text{Apparent depth}=\frac{\text{Real depth}}{\mu }$
$⟹=\frac{8}{\left(\frac{4}{3}\right)}=6\text{m}$