$A$ ray of light is incident on a right-angled isosceles prism parallel to its base as shown in the figure. The refractive index of the material of the prism is $\sqrt{2}$. Which of the following statement$(s)$ is/are true?

  • A
    The reflection at $P$ is total internal.
  • B
    The reflection at $Q$ is total internal.
  • C
    The ray emerging at $R$ is parallel to the ray incident at $S$.
  • D
    Total deviation of the ray is $150^{\circ}$.

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