- w = landa x D / s
- w = fringe spacing, the distance between two adjacent maxima or two adjacement minima in m
- landa = wavelength in m
- D = distance between slits and screen in m
- s = distance between slits in m
Since the wavelength of light is so small you can see from the formula that a high ratio of D/s is needed to make the fringe spacing big enough to see.
Rearranging, you can use landa = (w x s) / D to calculate the wavelength of light.
The fringes are usually so tiny that it's very hard to get an accurate value of w.
It's easier to measure across several fringes then divide by teh number of fringe widths between them.
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