Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensHard2 minPYQ_2011

PhysicsHardsingle choice

A thin convergent glass lens $(μ_{g} = 1.5)$ has a power of $+ 5.0 D$ . When this lens is immersed in a liquid of refractive index $μ,$ it acts as a divergent lens of focal length $100 cm$ . The value of $μ$ must be

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Solution:

$\frac{P _{a}}{P _{1}} = \frac{( \frac{μ _{g}}{μ _{a}} - 1 )}{( \frac{μ _{g}}{μ _{1}} - 1 )} = \frac{+ 5}{- 100/100} = - 5$ $- 5 (\frac{μ _{g}}{μ _{1}} - 1) = \frac{μ _{g}}{μ _{a}} - 1$ $\frac{1.5}{μ _{1}} - 1 = \frac{- 1}{5} (1.5 - 1) = - 0.1$ $μ_{1} = \frac{1.5}{0.9} = \frac{5}{3}$

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

⏱ 2mℹ️ Source: PYQ_2011

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