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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsTIR/Prism and DispersionHard2 minPYQ_2013

PhysicsHardsingle choice

A point source of light is placed 4 m below the surface of water of refractive index $5/3$ . The minimum diameter of a disc which should be placed over the source on the surface of water to cut-off all light coming out of water is

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Answer:

Solution:

Given, $sin i = \frac{1}{μ} = \frac{3}{5}$ So, $tan i = \frac{3}{4} = \frac{r}{4}$ It gives $r = 3 m$ So, the diameter $= 6 m$ .

Stream:JIPMERSubject:PhysicsTopic:Geometrical OpticsSubtopic:TIR/Prism and Dispersion

⏱ 2mℹ️ Source: PYQ_2013

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