A classical electromagnetic wave (infrared light) is traveling to the right through two media (1 and 2) of different indices of refraction n1 and n2, respectively (position is given in microns, mm). As the light encounters a change in index of refraction, part of it is transmitted through and part is reflected backwards. Shown in red is the left-moving part of the EM wave (the reflected wave) and shown in blue is the right-moving part of the EM wave (the incident wave in Region 1 and the transmitted wave in Region 2).
1. How does the reflected wave in Region 1 compare to the incident wave in Region 1? Be as explicit as possible.
2. Vary n2 from 1 to 5 by clicking the links above. As n2 increases, what happens to the reflected wave compared to the incident wave?
3. Consider the case when n2 = 5. Looking at the waves in Region 1, if they were combined, what would the combination look like?