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Unformatted text preview: toupal (rgt374) Homework 13 Chiu (58295) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Semiconductors such as silicon are 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 . 31, 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. 180 phase change 180 phase change Air Si 1 2 n = 1 n = 3.5 Find the minimum film thickness that pro- duces the least reflection at a wavelength of 494 nm. Answer in units of nm. 002 10.0 points Light is incident, from air, on a thin layer of oil (with index of refraction 1 . 2) that is floating on water (with index of refraction 1.33). What is the minimum thickness of the oil in the region that reflects green light (of wave- length 537 nm)? Answer in units of nm. 003 10.0 points Two rectangular, optically flat glass plates (index of refraction 1 . 56) are in contact along one end and are separated along the other end by a spacer that is 3 . 7 m thick. The top plate is illuminated by monochromatic light of wavelength 593 . 6 nm. Calculate the number of dark parallel bands crossing the top plate (including the dark band at zero thickness along the line of con- tact between the two plates). The last dark band is to be counted if and only if its cen- ter (where the intensity is zero) is present....
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