045 10.0 points A thin film of cryolite (nc = 1.27) is applied to a camera lens
ID: 1401064 • Letter: 0
Question
045 10.0 points A thin film of cryolite (nc = 1.27) is applied to a camera lens (ng = 1.67 ). The coating is designed to reflect wavelengths at the blue end of the spectrum and transmit wavelengths in the near infrared. What minimum thickness gives high transmission at lambda = 1076 nm? Answer in units of nm 046 10.0 points A thin layer of oil (with index of refraction 1.2) is floating on water. What is the minimum thickness of the oil in the region that reflects green light (of wave length 530 nm)? Answer in units of nm 047 10.0 points A soap film appears red (of wavelength 6510 nm) when viewed with incident white light that is perpendicular to the film. If the index of refraction of the film is 1.84. what is the minimum thickness of the film? Answer in units of nm.Explanation / Answer
here
path difference required = = 2 * t * nc
t = 1076 * 10^–9 / 2 * 1.27 = 423 nm
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