I know that diffraction pattern depends upon the width of slit but does the thickness of slit also matters? If so then what happens to the diffraction pattern at variable slit thickness?enter image description here

  • The short answer is, no, the thickness does not matter. The wave passes through the gap as it entered. Upon exiting the gap is then when the wave spreads out in all directions. (this is provided the wave enters perpendicular to the slit "face".) – Brad S Dec 6 at 19:39
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    Sound like a good simple testable question. If you tested it I’d be interested in seeing the results. – Lambda Dec 6 at 19:55
  • @BradS Reflections matter. There is Lloyd's mirror. And with a knife edge above a surface, one gets a reflecting slit twice the width. – Pieter Dec 6 at 23:33

As soon as you ask such questions you are considering a real material situation, not an abstract one. Which material is the slit made of? Which particle is diffracted? The answer to your question is that the pattern depends on this and on the thickness of the slit.

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