534 Atomic Physics*P42.51(a)The light in the cavity is incident perpendicularly on themirrors, although the diagram shows a large angle ofincidence for clarity. We ignore the variation of the indexof refraction with wavelength. To minimize reflection ata vacuum wavelength of 632.8 nm, the net phasedifference between rays (1) and (2) should be 180°. Thereis automatically a 180° shift in one of the two rays uponreflection, so the extra distance traveled by ray (2) shouldbe one whole wavelength:12SiO2FIG. P42.5122632 8217tntn====λ. nm21.458nmaf(b)The total phase difference should be 360°, including contributions of 180° by reflection and180° by extra distance traveled
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