A) Red
B) Green
C) Yellow
D) Violet
Correct Answer: D
Solution :
\[_{a}{{\mu }_{g}}=\frac{1}{\sin C}\Rightarrow \sin C=\frac{1}{_{a}{{\mu }_{g}}}\] As\[\mu \] for violet colour is maximum, so sin C is minimum and hence critical angle \[C\] is minimum for voilet colour.
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