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Homework_13

# Homework_13 - toupal(rgt374 Homework 13 Chiu(58295 This...

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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 μ 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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