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How would I figure out the answer to this question?

A critical angle of 24.4 degrees applies to:
a) light travelling from air into diamond
b) light travelling from diamond into air
c) light travelling from water into diamond
d) light travelling from diamond into water

  • physics -

    sin 24.4=.413
    1/sin 24.4= 2.42

    Does that index of refraction mean anything?

    Go through Snell's law.

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