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Homework Statement
What is the slit width? Wavelength is 635 nm. Distance between screen and slit, 2.5 m. Distance on screen between first and second minima above the central maxima is delta 6 mm.
Homework Equations
D* sin theta * = m * lambda
tan theta = x/ distance between screen and slit
The Attempt at a Solution
I set lambda/sin theta m2-sin theta m1= 2*lambda/ sin theta m2
tan theta 2m = x + 6 *10^-3 m/2.5
I tried to plug it in, but i got stuck. What's the correct approach?