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Two transparent media and are separated by a plane boundary. The speed of light in those media are 8 1 1.5 10 ms   and 8 1 2.0 10 ms   , respectively. The critical angle for a ray of light for these two media is:

1.   1 sin 0.750 
2.   1 tan 0.500 
3.   1 tan 0.750 
4.   1 sin 0.500  Second interface Incident ray First interface glass sphere air 1 2  1 2 

Correct answer:   1 sin 0.750 

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