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1) A ray of light enters the top of a glass of water at an angle of 37° with the vertical. What is the angle between the refracted ray and the vertical?

At first I thought I could just do 90-37, but that did not work, and then I tried solving for angles of incidence and refraction but they both did not work. Snells Law=ni sin theta i=nr sin theta r

2)Light strikes the surface of a prism, n = 1.4, as shown. If the prism is surrounded by a fluid, what is the maximum index of refraction of the fluid that will still cause total internal reflection within the prism?

i'm not sure what to do for this problem, does snell's law still apply, would i solve for the critical angle?