Diffraction by a Single Slit

1
Diffraction by a Single Slit
First minima
Dark fringes
m 1,2,3,...
2
Diffraction by a Double Slit
3
Diffraction by a Double Slit
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Diffraction Gratings
Maxima
d grating spacing n number of rulings / m
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X-Ray Diffraction
Maxima
d property of atomic structure
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A graph of intensity versus angular position for
the diffraction of an x-ray beam by a crystal.
The beam consists of two wavelengths, and the
spacing between the reflecting planes is 0.94 nm.
What are the two wavelengths?