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Homework Statement
I am required to calculate the width of a single slit. I have known distance, L, between the observation screen and the slit, and photo images were taken of the resulting waveform. However, the wavelength is unknown, therefore making many of the equations I'm attempting to use void.
Homework Equations
asinθ = mλ ; for a dark fringe, were a is the slit width, λ is the wavelength, and m is the order of the minimum. However, as in my case both λ and a are unknown, this cannot be used.
The Attempt at a Solution
I'm usure as to what equations/theory i can use, although i know i can use pythagoras to find the distance between a fringe and the slit, using L and the distance of fringes from the centre of the screen.
Thanks.