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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsTIR/Prism and DispersionEasy2 minPYQ_2020

PhysicsEasysingle choice

The face $A C$ of a prism $A B C$ of refracting angle $30 °$ is silvered. A ray is incident on face $A B$ at an angle of $45 °$ as shown in figure. The refracted ray undergoes reflection at face $A C$ and retraces its path. The refractive index of the prism is

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Answer:

Solution:

In $Δ A I P$

$\Rightarrow 90 ° - r + 90 ° + 30 ° = 180 °$

$\Rightarrow - r + 30 ° = 0$

$\Rightarrow r = 30 °$

Now,

$μ = \frac{\sin 45 °}{\sin 30 °}$

$\Rightarrow μ = \frac{\frac{1}{\sqrt{2}}}{\frac{1}{2}}$

$\Rightarrow μ = \sqrt{2}$

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

⏱ 2mℹ️ Source: PYQ_2020

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