Question

Suppose you want to produce a double-slit interference  pattern where the distance between successive bright fringes on the screen as a least 1.25cm. If the slits have a width of 0.0400 mm and a separation of 0.250 mm, what is the minimum distance needed from the slits to the screen when He-Ne laser (wavelength = 633nm) is used?

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Wave Optics

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