A possible means for making an airplane radar-invisible is to coat the plane with an antireflective polymer. If radar waves have a wavelength of 3.84 cm, and the index of refraction of the polymer is n = 1.6, how thick would the coating be if a 180 phase change occurs at both surfaces?
a. 24 mm
c. 32 mm
b. 7.5 mm
d. 6.0 mm
Question 2
A puddle of water (n = 1.33) is covered with a very thin layer of oil (n = 1.20). How thick is the oil in the region that strongly reflects light with a wavelength of 497 nm?
a. 207 nm
c. 458 nm
b. 550 nm
d. 229 nm
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