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Unformatted text preview: pendicularly to
a screen illuminates an aperture in the
screen. The diffraction pattern far from
the screen is just the Fourier transform of
the function that describes the aperture.
= sin , =
+ = 2 cos
Maxima when + sin = Dirac delta function is an infinitely narrow
pulse of infinite height that has an area of 1.
=1 + () +
= 2 cos
or 2 sin ≅ − =
= ∝ cos =() +
sin For an electromagnetic wave, the electric and magnetic fields are perpendicular
to each other and to the direction of propagation.
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