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

question 39

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

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