Total internal reflection can take place only if:
Explanation:
T.I.R. (Total Internal reflection)
i < C (condition for T.I.R.)
By Snell's Law
$\text{n}_1\sin\text{i}=\text{n}_2\sin90^{\circ}$
$\sin\text{i}=\frac{\text{n}_2}{\text{n}_1}=\sin\text{C}$
$\text{þ} \ \text{C}=\sin^{-1}$
$\because \ -1\leq\sin\text{i}\leq1$
n1 > n2 (so we can conclude that light goes from optically denser medium to rarer medium & incident angle is greater than the critical angle.)
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