In the Equation $\phi$ = (2 $\pi$ A $\lambda$ ) Sin $\theta$ For Single-Slit Diffraction

Multiple Choice

In the equation $\phi$ = (2 $\pi$ a/ $\lambda$ ) sin $\theta$ for single-slit diffraction, $\phi$ is:

A) the angle to the first minimum
B) the angle to the second maximum
C) the phase angle between the extreme rays
D) N $\pi$ where N is an integer
E) (N + 1/2) $\pi$ where N is an integer