Ignore: How the interference pattern will look like in a double-slit experiment done with two different mediums? Air before the slit and glass after the slit.[pic][1]

Edit: How the waves pattern will look like in a double-One-slit experiment done with two different mediums? diffraction in the Air and refraction in the glass. [![enter image description here][2]][2]

If light refract because one part of it is slower than the other then what will happen if the middle of the is wave slower the the others. [pic reference][3] 


  [1]: https://i.sstatic.net/YRxwe.gif
  [2]: https://i.sstatic.net/Vw5ek.png
  [3]: https://i.sstatic.net/U0uNa.gif