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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensHard2 minPYQ_2021

PhysicsHardsingle choice

The radii of curvature of both the surface of a convex lens of focal length ' $f$ ' and focal power ' $P$ ' are equal. One of the surfaces is made plane by grinding. The new focal length and focal power of the lens is respectively

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Answer:

Solution:

$P = \frac{1}{f} = (μ - 1) (\frac{1}{R} + \frac{1}{R}) = (μ - 1) \frac{2}{R} P^{'} = \frac{1}{f ^{'}} = (μ - 1) \frac{1}{R} ∴ P^{'} = \frac{P}{2} and f^{'} = 2 f$

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

⏱ 2mℹ️ Source: PYQ_2021

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