What is the index of refraction of a light that enters an unknown substance from water at an angle of 60°, and refracts at angle of 35°?

Answer 1

The beam is at a 60deg angle. After entering the water it's new angle is 35 deg.

i=60,r=55.

n2/n1=(sin i)/(sin r)=60sin/55sin=.866/.819=1.057