Suppose You Observe 19 Bright Fringes in the Central Maximum

Multiple Choice

Suppose you observe 19 bright fringes in the central maximum of a double-slit interference pattern. If you know that the separation of the slits d = 0.06 mm, you can conclude that the width of each slit is

A) 0.048 mm.
B) 0.024 mm.
C) 0.003 mm.
D) 0.006 mm.
E) 0.012 mm.