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# A swimmer is swimming at a depth of 12 m below the surface. A bird flying in the sky appears 36 m directly above his eyes. At what height is the bird is actually flying from the surface of water

$(a)\;24\; m \\ (b)\;12\;m \\ (c)\;18\;m \\ (d)\;9\;m$

We know that when we view from underwater.
$\mu =\large\frac{apparent \; height }{real \;height}$
Apparent height from surface $= 36-12=24 m$
$\mu =\large\frac{4}{3}$
$\large\frac{4}{3}=\frac{24}{real\;height}$
Real height $= 18\;m$
Hence c is the correct answer.