[X is denser medium and \...] A light ray is incident on a transparent material x which is in contact with another transparent mat

For Competitive Exams

A light ray is incident on a transparent material x which is in contact with another transparent material Y. The reason for the ray to all in emerging out through Y is

X is rarer medium and $\angle$i < C

X is denser medium and $\angle$i > C

Y is rarer medium and $\angle$i < C

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