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You are invited to visit the western desert of Iraq. You decide to impress your hostsby showing them what you know about physical optics. You decide to use a hair from hisgoat, which your host knows (through careful desert wisdom) has a thickness of 10 μm.You have a red laser pointer with wavelength 660 nm. How many dark fringes can you show them on a 1.1 m x 1.1 m screen that is 10 m away?

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