(Answered) A parallel beam of light from a he-ne laser with a

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A parallel beam of light from a He-Ne laser, with a wavelength of 656 nm fall on two slits and produces an interference pattern in which the third order fringe is 32.0 mm from the central fringe on a screen 1.60 m away.

a) What's the separation of the two slits?

b) What's the width of the central bright band?

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