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A fish at a depth of $12 \mathrm{~cm}$ in water is viewed by an observer on the bank of a lake. To what height the image of the fish is raised.
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The correct answer is:
$3 \mathrm{~cm}$
Apparent rise $=d\left(1-\frac{1}{a \mu_w}\right)$
$\begin{aligned} & =12 \times\left(1-\frac{3}{4}\right) \\ & =12 \times \frac{1}{4}=3 \mathrm{~cm}\end{aligned}$
$\begin{aligned} & =12 \times\left(1-\frac{3}{4}\right) \\ & =12 \times \frac{1}{4}=3 \mathrm{~cm}\end{aligned}$
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