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Semiconductors such as silicon arc used to fabricate solar cells - devices that generate electricity when exposed to sunlight. Solar cells are coated with a transparent thin film, whose index of refraction is 1.54, in order to minimize reflective losses from the surface. A silicon solar cell (index of refraction 3.5) is coated with a thin film for this purpose, sd in the figure Find the minimum film thickness that produces the least reflection at a wavelength of 523 nm. Answer in units of nm

 

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