Just understanding wording - optics

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The discussion centers on clarifying the wording of a diffraction question regarding the placement of a lens with a specific focal length. Participants are trying to determine whether "behind the slit" means the lens is positioned between the light source and the slit or between the slit and the screen. The consensus leans towards the interpretation that the lens is indeed between the slit and the screen, as it is viewed from the screen side. This understanding is crucial for accurately answering the diffraction question. Clear communication of these concepts is essential for proper interpretation in optics.
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I have a question regarding diffraction. The actual question itself isn't too hard (I don't think!), but I'm having problems with the wording of it.

Basically it says that a lens of focal length xcm is placed behind the slit, and the screen where the diffraction pattern is formed is in the focal plane of the lens.

Now does behind the screen mean that a) the lens is between the light source and slit, or b) between the slit and screen?

I'm pretty sure I have the knowledge required to answer either version of the question, but obviously don't want to answer the wrong one. Which version would you guys assume it is? I think its possibly a).
 
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I too think a) is correct. It is said to be behind because u are viewing the slits from the screen side.
 

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