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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsTIR/Prism and DispersionMedium2 minPYQ_2016

PhysicsMediumsingle choice

For a situation shown in figure, find the refrective index of glass so that it will suffer total internal reflection at the vertical surface.

Options:

Answer:

Solution:

Clearly $r + i_{c} = 9 0^{\circ}$ $r = 90 - i_{c} μ = \frac{sin i}{sin r} = \frac{sin 6 0 ^{\circ}}{sin ( 90 - i _{c} )}$
From eqns (i) and (ii) $or \Rightarrow sin i_{c} = \frac{2 cos i _{c}}{3} \Rightarrow tan i_{c} = \frac{2}{3} i_{c} \approx 4 9^{\circ} 1 1^{'} \approx 5 0^{\circ} μ = \frac{1}{sin i _{c}} = \frac{1}{sin 5 0 ^{\circ}} = 1.31$

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

⏱ 2mℹ️ Source: PYQ_2016

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