In a Young\'s double-slit experiment, a set of parallel slits with a separation
ID: 1495075 • Letter: I
Question
In a Young's double-slit experiment, a set of parallel slits with a separation of 0.142 mm is illuminated by light having a wavelength of 555 nm and the interference pattern observed on a screen 4.50 m from the slits.
(a) What is the difference in path lengths from the two slits to the location of a second order bright fringe on the screen in m?
(b) What is the difference in path lengths from the two slits to the location of the second dark fringe on the screen, away from the center of the pattern in m?
Explanation / Answer
(A) Path Difference = m*wavelength <---- Bright Fringe
Path Difference = 2*555 nm = 1,11 microns
(B) Path Difference = (m + (1/2))*wavelength <---- Dark Fringe
Path Difference = 2,5*555 nm = 1,3875 microns