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

Question

Quizplus · Accepted Answer

The angular separation between adjacent dark fringes is given by:$$	heta = \frac{\lambda}{d}$$where:$$	heta$$ is the angular separation in radians$$\lambda$$ is the wavelength of light in meters$$d$$ is the distance between the slits in metersSubstituting the given values into the equation, we get:$$	heta = \frac{450 	imes 10^{-9} 	ext{ m}}{1.8 	imes 10^{-3} 	ext{ m}} = 0.25 	ext{ rad}$$Therefore, the correct answer is C) 0.25.

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