Just understanding wording - optics

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SUMMARY

The discussion centers on the interpretation of the placement of a lens in relation to a slit and a screen in a diffraction experiment. Participants clarify that when a lens of focal length x cm is described as being "behind the slit," it refers to the lens being positioned between the slit and the screen, not between the light source and the slit. This understanding is crucial for accurately answering questions related to diffraction patterns formed on the screen.

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  • Knowledge of the relationship between light sources, slits, and screens in experimental physics.
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Brewer
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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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