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?
Product description video:
https://youtu.be/x6x7fjEvncs