Chapter 24, Problem 5RQ

Review Question 24.5 Equation (24.6), $w\text{ sin }{\theta }_m\text{=m}\lambda \text{, where }m\text{ = ± 1, ± 2, ±3}\mathrm{...}$ describes the angles at which one can see dark fringes produced by light passing through a single slit. Write a similar equation describing the angles at which one can see dark fringes produced by monochromatic light passing through two narrow slits.