For total internal reflection to take place, the angle of incidence i and the refractive index $\mathrm{\mu }$ of the medium must satisfy the inequality

• A

  $\frac{1}{\mathrm{sini}}<\mathrm{\mu }$

• B

  $\frac{1}{\mathrm{sini}}>\mathrm{\mu }$

• C

  $\mathrm{sini}<\mathrm{\mu }$

• D

  $\mathrm{sini}>\mathrm{\mu }$