Light enters an isosceles right triangular prism at normal incidence through face AB and undergoes total internal reflection at face BC as shown below. The minimum value of the refractive index of the prism is close to
1.1
1.55
1.42
1.72
A
1.1
B
1.55
C
1.72
D
1.42
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Solution
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n1=1;n2=?;θ1=900;θ2=450 using snell's law n1sinθ1=n2sinθ2 n2=sin900sin450 n2=1.414 Hence, the minimum value of the refractive index of the prism is close to 1.42.
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