1.
In a Young's twoslit experiment, light rays from the two slits that
reach the second minimum on one side of the central maximum travel
distances that differ by…
Solution:
The central maximum corresponds to the integer
m
= 0 in the constructive
interference equation
∆
l
=
m
λ
, meaning that the path lengths are exactly equal.
The first minimum (destructive interference) to one side is caused by path lengths
that differ by
λ
2 . Going to the next minimum adds another wavelength to the
path length difference. So for the second minimum, the total path length difference
is
λ
2
+
λ
=
3
λ
2 .Coherent monochromatic light of wavelength
_
passes through a pair of slits
separated by distance
d
, to produce a pattern of maxima and minima a distance
L
away from the slits. What would cause the separation between adjacent minima to
decrease? (Choose all that apply.)
Solution:
The equations we are interested in considering are the twoslit interference
equation,
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 Spring '08
 SEATON
 Light, Wavelength, path length difference, interference equation

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