Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensMedium2 minPYQ_2019

PhysicsMediumsingle choice

A double convex lens has focal length $25 cm$ . The radius of curvature of one of the surfaces is doubled of the other. Find the radii, if the refractive index of the material of the lens is 1.5.

Options:

Answer:

Solution:

$\frac{1}{f} = (μ - 1) [\frac{1}{R _{1}} - \frac{1}{R _{2}}] \frac{1}{25} = 0.5 [\frac{1}{R} - (\frac{1}{2 R})] \frac{1}{25} = \frac{0.5}{10} [\frac{3}{R}] R = \frac{75}{4} = 18.75 R_{1} = 18.75 cm, R_{2} = 37.5 cm$

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

⏱ 2mℹ️ Source: PYQ_2019

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