Monochromatic light falls on a slit that is 2.60 *10^-3 mm wide. If the angle between the first dark fringes?

on either side of the central maximum is 35.0 degrees(dark fringe to dark fringe). what is the wavelength of the light used?

781.835 nm.
Theta (on one side) = 17.5 deg.
lambda = a*sin(theta)/m = 781.835 nm (a is slit width, m is order, =1)

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