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What is the critical angle for a light ray hitting an interface with index of refraction of 1.74 on the incident side and 1.56 on the refracted side?

^o ?

What is the critical angle for a light ray hitting an interface with index of refraction of 1.6 on the incident side and 1.38 on the refracted side?

^o ?

What is the critical angle for a light ray hitting an interface with index of refraction of 1.95 on the incident side and 1.4 on the refracted side?

^o ?

What is the critical angle for a light ray hitting an interface with index of refraction of 1.57 on the incident side and 1.54 on the refracted side?

^o ?

What is the critical angle for a light ray hitting an interface with index of refraction of 1.42 on the incident side and 1.27 on the refracted side?

^o ?

What is the critical angle for a light ray hitting an interface with index of refraction of 1.39 on the incident side and 1.15 on the refracted side?

^o ?