Question on young's double experiment

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In Young's double slit experiment, keeping the opaque screen parallel to the two slits simplifies calculations and enhances the symmetry of the setup. If the screen were transparent instead of opaque, it would compromise the distinctiveness of the two slits, turning the setup into a single sheet with slits. This change would lead to interference patterns being obscured by additional light passing through the transparent material. The opaque screen is essential for maintaining clear visibility of the interference fringes. Thus, the configuration of the screen is crucial for the experiment's clarity and effectiveness.
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why we have to kept opaqe screen parllel to the two slits in young's double slit experiment?
 
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Hi SAINATHAN! Welcome to PF! :wink:

We don't have to …

but it makes the maths easier, and the picture more symmetric and prettier. :smile:
 
If the rest of teh screen wasn't opaque, but was see-thru, you would really no longer have two slits but just ahve a sheet of transparent material with two slits in it. This would result in the fringes and light spots being obscured by all the other light getting through,
 

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