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If n1 = 1.7 and n2 = 1.37, what is the critical angle for light incident from side 1?

^o ?

If n1 = 1.53 and n2 = 1.24, what is the critical angle for light incident from side 1?

^o ?

If n1 = 1.9 and n2 = 1.63, what is the critical angle for light incident from side 1?

^o ?

If n1 = 1.87 and n2 = 1.1, what is the critical angle for light incident from side 1?

^o ?

If n1 = 1.37 and n2 = 1.33, what is the critical angle for light incident from side 1?

^o ?

If n1 = 2 and n2 = 1.66, what is the critical angle for light incident from side 1?

^o ?