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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensMedium2 minQB

PhysicsMediumsingle choice

. A plane convex lens is made of glass $(n = 1.5)$ with one flat surface and the other having a radius of 20 cm. What is the focal length (in cm) of the lens?

Options:

Answer:

Solution:

$\frac{1}{f} = (n - 1) (\frac{1}{R _{1}} - \frac{1}{R _{2}}) = (1.5 - 1) (\frac{1}{20} - \frac{1}{\infty}) = \frac{1}{40} \Rightarrow f = 40 cm$

Hence (C).

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

⏱ 2mℹ️ Source: QB

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