[4p QUESTION 2. An electromagnetic wave of wavelength 500 nm in the air enters a cubical block of glass of refractive index 1.5. It eventually exits the glass at the other end. Assume the refractive index of air is 1.00. (a) Use a well-labeled diagram to explain what happens to the wave as after it enters the glass, within the glass and as it exits the glass. (b) If the angle of incidence is 35º, at what angle to the vertical does it travel through the glass? (c) Calculate the frequency of the wave within the glass cube. (d) At what angle to the vertical does the wave exit the other end of the glass?​