Conditions for total internal reflection

1. A.
   light travels from denser to rarer medium and $i < i_c$.
2. B.
   light travels from rarer to denser medium and $i < i_c$.
3. C.
   light travels from denser to rarer medium and $i > i_e$.
4. D.
   light travels from rarer to denser medium and $i > i_c$.

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1. A.
   $i < i_{c}$
2. B.
   $i = i_{c}$
3. C.
   $i = \frac{\pi_{c}}{2}$
4. D.
   $i > i_{c}$

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