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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at plane surfaceMedium3 minQB

PhysicsMediumsingle choice

A fish rising vertically up towards the surface of water with speed $3 ms^{- 1}$ observes a bird diving vertically down towards it with speed $9 ms^{- 1}$ . The actual velocity of bird is ( $μ$ of water is $\frac{4}{3}$ )

Options:

Answer:

Solution:

The fish sees the bird's apparent velocity magnified by $μ = 4/3$ (viewed from water into air).

$μ v_{b} + v_{f} = 9 \Rightarrow \frac{4}{3} v_{b} = 9 - 3 = 6$

$v_{b} = 4.5 m / s$

Answer: A

Stream:JEESubject:PhysicsTopic:Geometrical OpticsSubtopic:Refraction at plane surface

⏱ 3mℹ️ Source: QB

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