Question
A fish is swimming in a river at a depth of 20 cm from the surface of the water. Refractive Index of water is 43. At what depth will an eagle flying above the water and exactly above the fish will see the fish?
Answer: Option D
:
D
Given:
Refractive index of water, μwater = 43
Real depth of fish from surface of water=20cm
In the given situation,
Refractive Index of water =μwater=RealdepthApparentdepth
⇒Apparentdepth=Realdepthμwater
⇒Apparentdepth=2043
Therefore, Apparentdepth=20×34 = 15 cm. The eagle will perceive the fish to be at 15cm depth from the water surface.
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:
D
Given:
Refractive index of water, μwater = 43
Real depth of fish from surface of water=20cm
In the given situation,
Refractive Index of water =μwater=RealdepthApparentdepth
⇒Apparentdepth=Realdepthμwater
⇒Apparentdepth=2043
Therefore, Apparentdepth=20×34 = 15 cm. The eagle will perceive the fish to be at 15cm depth from the water surface.
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