1. The problem statement, all variables and given/known data 1. Sunlight strikes a piece of crown glass at an angle of incidence of 37.9 degrees. Calculate the difference in the angle of refraction between a red (660 nm) and a blue (470 nm) ray within the glass. The index of refraction is n=1.520 for red and n=1.531 for blue light. 2. The ray now travels inside the glass. What is the minimum angle of incidence at which the red ray can hit the surface of the glass and become there totally internally reflected and not refracted? 3. [1pt] A light ray of lambda = 530 nm enters at an angle of incidence of 36.2 degrees from air into a block of plastic. Its angle of refraction is 20.2 degrees. What is the speed of the light inside the plastic? 2. Relevant equations 1) n(sin theta 1)=n(sin theta 2) 3) sin theta plastic=n air/n plastic V=C/n 3. The attempt at a solution For number 3 i keep getting 8.57E8 m/s and the computer keeps telling me it's wrong what am i doing wrong here?