25. ssm A diffraction pattern forms when light passes through a single slit. The wavelength of the light is 675 nm. Determine the angle that locates the first dark fringe when the width of the slit is (a) 1.8 x 10-4 m and (b) 1.8 x 10-6 m.

For diffraction from a single slit, dark fringes are found from the relationship

Solving for q

m is 1 for the first dark fringe.

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