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NEET 2010 (AIPMT, Prelims) · Total Internal Reflection

Total Internal Reflection question from NEET 2010 (AIPMT, Prelims)

Q54NEET 2010 · AIPMT · PRELIMSEasy

Total Internal Reflection

A ray of light travelling in a transparent medium of refractive index μ\mu, falls on a surface separating the medium from air at an angle of incidence of 45°. For which of the following value of μ\mu the ray can undergo total internal reflection?

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Answer: (c)

  1. TIR at i=45∘i = 45^\circ requires 45∘>C45^\circ > C, i.e. sin⁡C=1μ<sin⁡45∘=12\sin C = \frac{1}{\mu} < \sin 45^\circ = \frac{1}{\sqrt{2}}.
  2. μ>2=1.414\mu > \sqrt{2} = 1.414
  3. Only 1.501.50 satisfies this.
  4. So the answer is (c) μ=1.50\mu = 1.50.
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