Chapter 36, Problem 64E

(a)

To determine

To show: The condition for maximum intensity for an angle of incidence $\theta \text{'}$ is $d\left(\sin \theta +\sin \theta \text{'}\right)=m\lambda$.

(b)

To determine

The angles of the maxima corresponding to $m=1$, $m=0$ and $m=-1$ for $\theta \text{'}=0°$ (normal incidence) and for $\theta \text{'}=20.0°$.