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A possible means for making an airpolane invisible to radar is to coat the plan with...

A possible means for making an airpolane invisible to radar is to coat the plan with an anti-reflective polymer. The radar waves have a wavelength of 4.23 cm and the index of refraction of the polymer is 1.64. What is the minimum thickness required to make the coating? Assume that the plane is made of metal, so electromagnetic waves will have a \pi phase change upon relfections from the plane's surface. Answer in units of cm

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