© Copyright, Department of Physics, University of Illinois at Urbana-Champaign

N Slits

Shown above is the intensity pattern observed on a screen 2 m from an arrangement of N-slits. The separation between adjacent slits is 0.01 mm, and the light incident on the slits has a wavelength of 500 nm. We observe a single secondary intensity peak between each of the maxima. These secondary peaks are one ninth the intensity of the maxima. An arrow is drawn on the diagram indicating another position where the intensity is also one ninth of the maxima but which does not correspond to a seconday peak. What is the smallest distance from the center of the screen where you can observe such a point?

x = m