A 35 card containing two pinholes 008mm in diamter, Ask an Expert

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A 3*5 card containing two pinholes, 0.08mm in diamter andseparated center to center by 0.10mm, is illuminated by parallelrays of blue light from an argon ion laser (wavelength= 487.99 nm).If the fringes on an observing screen are to be 10mm apart, how far away should the screen be?

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