Phase change occurs when a light ray is reflected by a medium of higher refractive index. When the ray from the air (refractive index = 1.00) is reflected by oil, a phase change will occur.
1. Follow these steps to solve this problem: A very thin oil film (noil = 1.25) floats on water (nwater = 1.33). What is the thinnest film that produces a strong reflection for green light with a wavelength of 500 nm?
2. As light travels from air into the water through the oil film,
a. both of the reflected waves undergo a phase change.
b. neither of the reflected waves undergoes a phase change.
c. only one of the reflected waves undergoes a phase change.
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