Critical angle from the speed of light, or the time light takes, in two media

1. A.
   $\sin^{-1}\!\left(\frac{3}{2}\right)$
2. B.
   $\sin^{-1}\!\left(\frac{2}{3}\right)$
3. C.
   $\sin^{-1}\!\left(\frac{4}{3}\right)$
4. D.
   $\sin^{-1}\!\left(\frac{3}{4}\right)$

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1. A.
   $\sin^{-1}\left(\dfrac{t_1}{t_0}\right)$
2. B.
   $\sin^{-1}\left(\dfrac{4t_0}{t_1}\right)$
3. C.
   $\sin^{-1}\left(\dfrac{4t_1}{t_0}\right)$
4. D.
   $\sin^{-1}\left(\dfrac{t_0}{4t_1}\right)$

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1. A.
   $\dfrac{\pi^c}{2}$
2. B.
   $\dfrac{\pi^c}{3}$
3. C.
   $\dfrac{\pi^c}{4}$
4. D.
   $\dfrac{\pi^c}{6}$

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