91. Medium A is adjacent to medium B. Medium A has an index of refraction of v3, while medium B has an index of refraction of v6. (A) It is possible for total internal reflection to occur for a ray of light in medium A that is incident upon medium B? If so, what is the critical angle for total internal reflection? (B) It is possible for total internal reflection to occur for a ray of light in medium B that is incident upon medium A? If so, what is the critical angle for total internal reflection?

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