Solve the all parts of given problem:
Problem: Yellow-green light of wavelength 550 nm in air is incident on the surface of a flat piece of crown glass at an angle of 60.
Part I: What is the angle of refraction of the light?
Part II: What is the speed of the light in the glass?
Part III: What is the wavelength of the light in the glass?
Explain each step and equations used to get the solution.