A pair of narrow slits that are 1.8 mm apart is illuminated by a monochromatic coherent light source.A fringe pattern is observed on a screen 4.8 m from the slits.If the wavelength of the monochromatic light is 450 nm,what is the angular separation between adjacent dark fringes on the screen,measured in milliradians?
A)0.15 mrad
B)0.20 mrad
C)0.25 mrad
D)0.30 mrad
E)0.36 mrad

Question

Quizplus · Accepted Answer

We can use the equation for the angular position of the fringes:

θ = λ/d

where θ is the angular separation, λ is the wavelength, and d is the distance between the slits.

Plugging in the given values, we get:

θ = (450 nm) / (1.8 mm) = 0.25 mrad

Therefore, the angular separation between adjacent fringes is 0.25 mrad. The answer is choice C.

A Pair of Narrow Slits That Are 1