Light travels from medium 1 to medium 2. It arrives at the surface of medium 2 at angle of 30 degrees, refracts, and leaves the surface of medium 2 at angle of 35 degrees. The index of refraction of medium 1 is 1.007

would you not do 90-30 and 90-35 to get your anwser or do you just plug in in like this.

1.007sin30=n2sin35