I need help with those problems. please

1. A light ray passes from a medium with an index of refraction of 1.02 into a medium with an index of 1.18. The incident ray strikes the interface at an angle of 17 with the normal. What is the angle of the refracted ray? 2. A light ray passes from air (n=1.00) into an unknown medium. The incident ray is at 12 to the normal, and the refracted ray is at 26. What is the index of refraction of the unknown medium