extra waves problem 2015 .pdf
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4. You wish to analyze the effect of a refractive lens on the interference pattern generated by an
excited Hafnium atom of wavelength λ. The first time you perform the Young’s double slit
experiment, you find that the zeroth order bright fringe occurs at a height halfway between the
two slits, as you would expect. You then cover the bottom slit with a convex lens of radial
thickness t and refractive index n and measure the height again. Find the difference in height y
of the zeroth order (m=0) bright fringe from the first to the second experiment.
Given: d = 3.0mm, R = 1.0m, t = 5.0mm, n = 2.0.
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