Problem 14-83 Diffraction

A point source emits light of wavelength $520\; nm$ toward a single slit of width $0.085\; mm$. The light creates a diffraction pattern on a screen located $2.2 \;m$ from the screen.

(a) What is the width of the central maximum?
(b) What angle do the first order fringes subtend with the slit?

[Ans. (a) $2.7 \;cm$   (b) $0.70^\circ$]

Which is the correct diagram for part (a) of this problem?

(A)

(B)

(C)