A student photographs the irradiance pattern of a Young's double-slit experiment and…
PHYSICS · Multi-part · Fermi University Physics · Optics & Photonics · Interference and diffraction · Interference and diffraction
Optics and Photonics, Ch Two-beam interference and interferometry
Problem
A student photographs the irradiance pattern of a Young's double-slit experiment and reads three quantities off the plotted profile: the bright fringes reach a peak irradiance of 9.0 units, the dark minima do not quite vanish and read 1.0 unit, and adjacent bright fringes on the screen are 2.4 mm apart. The screen is L=1.20 m from the slits and the light has wavelength λ=633 nm.
((a)) Read the fringe visibility V from the plot.
((b)) Find the ratio of the larger to the smaller of the two beam irradiances, I1/I2 (with I1>I2).
((c)) Find the slit separation d.