A beam of light consisting of red, green and blue colours is incident on a right-angled prism on face $A B$ . The refractive indices of the material for the above red, green and blue colours are $1.39, 1.44$ and $1.47$ respectively. A person looking on surface $A C$ of the prism will see

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For light to come out through face 'AC', total internal reflection must not take place. ​ i.e., θ < c ⇒ sin θ < sin c ⇒ sin θ < μ 1 ​ ​ or μ < s i n θ 1 ​ ⇒ μ < s i n 4 5 ∘ 1 ​ ⇒ μ < 2 ​ ⇒ μ < 1.414

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