The speed of light in two media $$M_1$$ and $$M_2$$ are $$1.5 \times 10^8$$ $$\mathrm{m} / \mathrm{s}$$ and $$2 \times 10^8 \mathrm{~m} / \mathrm{s}$$ respectively. If the light undergoes total internal reflection, the critical angle between the two media is
- A$$\sin ^{-1}\left(\frac{3}{2}\right)$$
- B$$\sin ^{-1}\left(\frac{2}{3}\right)$$
- C$$\sin ^{-1}\left(\frac{4}{3}\right)$$
- D$$\sin ^{-1}\left(\frac{3}{4}\right)$$
✓ Correct answer: D
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