I have read that diffraction of light can take place at an edge as well as through an aperture - but I never found an exact explanation of this condition. But can an edge have a size comparable to the wavelength of the light?

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    $\begingroup$ You need to elaborate a bit more as the statement as it stands does not make sense at best and is incorrect at worst. $\endgroup$
    – Farcher
    Jul 24 at 7:15
  • $\begingroup$ question edited - if it's not what you meant, edit again... $\endgroup$ Jul 24 at 8:09
  • $\begingroup$ Related/duplicate? When is diffraction most pronounced? $\endgroup$
    – Farcher
    Jul 24 at 9:46
  • $\begingroup$ An (old) link to Knife edge effect $\endgroup$ Jul 25 at 13:49