If the critical angle for total internal reflection from a medium to vacuum is $30^{\circ}$,then the velocity of light in the medium is:
- A$3 \times 10^{8} \ m/s$
- B$1.5 \times 10^{8} \ m/s$
- C$6 \times 10^{8} \ m/s$
- D$\sqrt{3} \times 10^{8} \ m/s$
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