Problem light of wavelength 700nm falls on two slits and, Ask an Expert

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Problem: Light of wavelength 700nm falls on two slits and produces an interference pattern in which the third-order bright red fringe is 39mm from the central fringe on a screen 2.8m away.

Part A- What is the separation of the two slits?

Thanks in advance who solve the above question and express your answer to two significant figures and include the appropriate units.

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