A manufacturer wants to improve the performance of a battery pack by reducing the amount of light reflected from its surface. You suggest applying a thin film of material with an index of refraction = 1.42 can help. These particular solar cells rely on light with a wavelength (in air) λ = 250 nm. The index of refraction of the material below the thin film is greater than 1.42. What are the phase shifts at the upper and lower boundries? What is the formula for interference condition between waves in upper and lower boundries? t= thickness of the film
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