L14_A：
1. Explanation of diffraction in multiply slits (n=4, a=4b)
1. Explanation of diffraction in multiply slits (n=4, a=4b)
2. Reciprocal lattice
3. Fourier transform
(1) definition
(2) orthonormal set
(3) inverse Fourier transform
L14_B：
1. Consider single slit
1. Consider single slit
2. Dirac delta function derivation －－-
compared to Fourier transform
compared to Fourier transform
3. Examples of Fourier transform
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