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An air bubble in water $\left(\mu=\frac{4}{3}\right)$ is shown in figure. The apparent depth of the image of the bubble in plane mirror viewed by observer is.
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The correct answer is:
24 cm
The refractive index of water,
$\mu=\frac{4}{3}$
The real depth of image of bubble from the surface of water,
$d=24+8=32 \mathrm{~cm}$
$\therefore$ Apparent depth of the image of bubble is
$d^{\prime}=\frac{d}{\mu}=\frac{32}{4 / 3}=24 \mathrm{~cm}$
$\mu=\frac{4}{3}$
The real depth of image of bubble from the surface of water,
$d=24+8=32 \mathrm{~cm}$
$\therefore$ Apparent depth of the image of bubble is
$d^{\prime}=\frac{d}{\mu}=\frac{32}{4 / 3}=24 \mathrm{~cm}$
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