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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensMedium2 minQB

PhysicsMediumsingle choice

. A double convex lens made of glass $(μ = 1.5)$ is immersed in water $(μ = 4/3)$ . If its focal length in air is 'F', then the focal length in water will be:

Options:

Answer:

Solution:

$(1.5 - 1) (\frac{1}{R _{1}} - \frac{1}{R _{2}}) = \frac{1}{F}$

$(\frac{1.5}{4} \times 3 - 1) (\frac{1}{R _{1}} - \frac{1}{R _{2}}) = \frac{1}{F} \frac{0.5}{0.5} \times 4 = \frac{F ^{'}}{F} \Rightarrow F^{'} = 4 F$

Stream:JEESubject:PhysicsTopic:Geometrical OpticsSubtopic:Refraction at curved surface/Lens

⏱ 2mℹ️ Source: QB

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