Question
With the help of suitable diagram explain the real depth and apparent depth.
✓
Answer
$\rightarrow$ Generally, we experience that a tank filled with water appears to be raised when viewed vertically or close to vertical.
$\rightarrow$ As shown in figure object $O$ is at the bottom of the tank. When it is viewed from air it observed at $O ^{\prime}$ which is virtual image.
$\rightarrow$ As shown in figure real depth of bottom is $h_2$ and apparent depth is $h_1$.
$\rightarrow$ For viewing near the normal direction, it can be shown that the apparent depth $\left(h_1\right)$ is equal to the ratio of the real depth $\left(h_2\right)$ to the refractive index $(n)$ of the medium.
$\therefore \text { apparent depth }=\frac{\text { real depth }}{\text { refractive index }}$
$\therefore h_1=\frac{h_2}{n}$
$\therefore \frac{h_1}{h_2}=\frac{1}{n}$
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