One of the refractive surfaces of a prism of angle 3 0 ∘ is silvered. A ray of light incident at an angle of 6 0 ∘ retraces it path. The refractive index of the material of prism is :

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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsTIR/Prism and DispersionMedium2 minQB

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One of the refractive surfaces of a prism of angle $3 0^{\circ}$ is silvered. A ray of light incident at an angle of $6 0^{\circ}$ retraces it path. The refractive index of the material of prism is :

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Answer:

Solution:

Ray retraces its path, so it falls normally on the silvered face

$r_{1} = A = 3 0^{\circ}$

$μ = \frac{sin 6 0 ^{\circ}}{sin 3 0 ^{\circ}} = 3$

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

⏱ 2mℹ️ Source: QB

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