I am using Snell's law to try and find the index of refraction of two elements, Water and then vegetable cooking oil. I measured the Angle of incidence for water which was 45 degrees, and the angle of refraction which was 32 degrees. How do I find the Index of refraction for water?

Then I did the same thing with vegetable cooking oil. My data was:

Angle of incidence: 57 degrees
Angle of refraction: 35 degrees

What would the index of refraction then be for the oil?