The diffraction minima equation:
a is the aperture diameter.
λ is the wavelength.
The aperture size should be less than the wavelength.
The spreading of waves behind an aperture is
a) more for long wavelengths and less for short wavelengths.
b) less for long wavelengths and more for short wavelengths.
c) the same for long and short wavelengths.
d) not discussed in this chapter.
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