Chapter 35, Problem 8Q

Figure 35-26 shows two rays of light, of wavelength 600 nm, that reflect from glass surfaces seprated by 150 nm. The rays are initially in phase. (a) What is the path length difference of the rays? (b) When they have cleared the reflection region, are the rays exactly in phase, exactly out of phase, or in some intermediate state?

Figure 35-26 Question 8.