$A$ monochromatic beam of light is incident at the interface of two materials of refractive index $n_{1}$ and $n_{2}$ as shown. If $n_{1} > n_{2}$ and $\theta_{C}$ is the critical angle,then which of the following statements is $NOT$ true?

• A
  $\theta_{1} = \theta_{3}$,for all values of $\theta_{1}$.
• B
  $\cos \theta_{2}$ is imaginary,for $\theta_{1} > \theta_{C}$.
• C
  $\cos \theta_{2} = 0$,for $\theta_{1} = \theta_{C}$.
• D
  $\cos \theta_{3}$ is imaginary,for $\theta_{1} = \theta_{C}$.