(adsbygoogle = window.adsbygoogle || []).push({}); Right so I've been stuck with this for a while now and I'm sure it's just something simple that I've missed. Right so the question says there are a pair of closely spaced slits (0.300mm apart). By changing the spacing the bright fringe moves from position m=2 to m=3. The wavelength remains constant. And that is all the information given in the question.

y_{m}=R(mλ/d)

So I've been given m and d but I don't have y_{m}or R (being the distance between the screen and the slits).

I would be very grateful if someone could be help find y_{m}or R. Thanks

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# Two slit interference

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