Conditions for a light ray to pass undeviated - class-X

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Light starting from a medium of refractive
index $  \mu  $ undergoes refraction into a medium of index $  \mu  $. If I and r stand for angle of incidence are refraction respectively :

  1. $

    \frac{\sin i}{\sin r}=\frac{\mu}{\mu^{\prime}}

    $
  2. $

    \frac{\sin i}{\sin r}=\frac{\mu^{\prime}}{\mu}

    $
  3. $

    \frac{\cos i}{\cos r}=\frac{\mu^{\prime}}{\mu}

    $
  4. $

    \frac{\sin i}{\sin r}=1 / \mu \mu^{\prime}

    $
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