Practice Problem on Refraction
                          -----                        
                          \ 60                                   /
                           \                                    /
                            \                                  /
                             \                                /
                              \                              /
     90                        \                            /
     |                          \                          /
     |                           \                        /
  ------- 0      n = 1.3          \     n = 1.9          /    n = 1.3 
     |                             \                    /   
     |                              \                  /     
    -90                              \                /       
                                      \              /         
                                       \            /           
                                        \          /             
                                         \        / 60            
                                                  -----
Light is incident from the left at 28 degrees relative to the horizontal. What is the angle of the exiting light relative to the horizontal? Give your answer in degrees to two decimal places.

ANSWER = Total internal reflection at the second interface.