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  4. In a pond of water, a flame is held 2m above the surface of the water. A fish is at depth of 4m from the water surface. Refractive index of water is (4/3) . The apparent height of the flame from the eyes of fish is -

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Q. In a pond of water, a flame is held $2m$ above the surface of the water. A fish is at depth of $4m$ from the water surface. Refractive index of water is $\frac{4}{3}$ . The apparent height of the flame from the eyes of fish is -

NTA AbhyasNTA Abhyas 2022

Solution:

Apparent height of flame above water surface.
$h′= \, \mu h=\frac{4}{3}\times 2=\frac{8}{3}m$
Therefore, apparent height of the flame from the eye of fish
$=d+h′=4+\frac{8}{3}=\frac{20}{3}m$