If parallel light falls on a single slit of width D at a $28.0 ^\circ$ angle to the normal, describe the diffraction pattern.
Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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$D \sin \theta = D \sin \theta_i + m \lambda, m=\pm1, \pm2, \pm3, ...$