Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensEasy2 minPYQ_2015

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A planoconvex lens fits exactly into a planoconcave lens. Their plane surface are parallel to each other. If the lenses are made of different materials of refractive indices $μ_{1} & μ_{2}$ and $R$ is the radius of curvature of the curved surface of the lenses, then focal length of combination is

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Solution:

If F be the equivalent focal length, then $\frac{1}{F} = \frac{1}{f _{1}} + \frac{1}{f _{2}} \frac{1}{F} = (μ_{1} - 1) (\frac{1}{\infty} + \frac{1}{R}) + (μ_{2} - 1) (\frac{1}{- R} - \frac{1}{\infty}) = \frac{μ _{1} - μ _{2}}{R} F = \frac{R}{μ _{1} - μ _{2}}$

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

⏱ 2mℹ️ Source: PYQ_2015

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