A Possible Means for Making an Airplane Radar-Invisible Is to Coat

question 71

Multiple Choice

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 3.6 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) 11 mm
• B) 23 mm
• C) 5.6 mm
• D) 2.8 mm
• E) ​14 mm

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