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(10 pts) 3. The surface of a flat piece of glass is covered by a thin plastic that has thickness 180 nm. There is air above the plastic film. The refractive index of the glass is l.4 and the refractive index of the plastic film is 1.80. Light of wavelength 1Bir n air shines at normal incidence on the plastic film. What is the largest value of 1ir for which there will be constructive interference between the light reflected at the top and bottom surfaces of the film? air Ans. plastic glass

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e srence condition constckv intbrane Constsuctive a 4(1-30) (186x109m) 홀 296 nnn .

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