A ray of light incident normally on an isosceles right angled prism travels as shown in the figure. The least value of the refractive index of the prism must be
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answer is 1.41.
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Detailed Solution
From figure it is clear that TIR takes place at surface AC and BC i.e. 45∘>C ⇒sin45∘>sinC ⇒12>1μ⇒μ>2 Hence μleast =2