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26. (a) We note that, just as in the usual discussion of the double slit pattern, the
x
= 0
point on the screen (where that vertical line of length
D
in the picture intersects the screen)
is a bright spot with phase difference equal to zero (it would be the middle fringe in the
usual double slit pattern). We are not considering
x
< 0 values here, so that negative
phase differences are not relevant (and if we did wish to consider
x
< 0 values, we could
limit our discussion to absolute values of the phase difference, so that – again – negative
phase differences do not enter it).
Thus, the
x
= 0 point is the one with the minimum
phase difference.
(b) As noted in part (a), the phase difference
φ
= 0 at
x
= 0.
(c) The path length difference is greatest at the rightmost “edge” of the screen (which is
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics

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