Two transparent media A and B are separated by a plane boundary. The speed of light in those media are 1.5 10 8 m/s and 2.0 10 8 m/s , respectively. The critical angle for a ray of light for these two media is

1. A. -1 (0.750)
2. B. -1 (0.500)
3. C. -1 (0.750)
4. D. -1 (0.500)

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