Situation 17.2 a Pair of Narrow Slits,separated by 1.8 Mm,is Illuminated by Illuminated

Multiple Choice

Situation 17.2
A pair of narrow slits,separated by 1.8 mm,is illuminated by a monochromatic light source.Light waves arrive at the two slits in phase.A fringe pattern is observed on a screen 4.8 m from the slits.
-In Situation 17.2,monochromatic light of 450 nm wavelength is used.The angular separation between adjacent dark fringes on the screen,measured at the slits,in m rad,is closest to:

A) 0.15
B) 0.20
C) 0.25
D) 0.30
E) 0.36