Statement-1: For total internal reflection, angle of incident in denser medium must be greater than critical angle for the pair of media in contact.
Statement-2:   $\mu =\frac{1}{\sin C},$ where the symbols have their standard meaning.

If both statements are true and statement 2 is the correct explanation of statement 1.

If both statements are true but statement 2 is not the correct explanation of statement 1.

If statement 1 is true and statement 2 is false.

If  statement 1 is false but statement 2 is true.