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32. assignments (refraction)

A container, crown class (n=1.52), holds a small quantity of ethyl alcohol (n=1.361) what is the critical angle for internal reflection of a ray in the glass when it is incident on the glass to liquid surface? A different liquid is poured into the container and the critical angle for internal reflection is measured to be 53.2 degrees. What is the index of refraction of this liquid?
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