Find the distance on a flat screen between the principal image and the second order bright fringe for red light(wavelength=664nm)if there are 900 slits per centimeter and the screen is 2.75 meters from the slits.

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  1. .01 meter/900 = 1.11*10^-5 meters`

    sin T = T = 664*10^-9/1.11*10^-5 = .0598

    .0598 * 2.75 = .164 meters

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