Question on young's double experiment

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SUMMARY

The discussion centers on the necessity of using an opaque screen parallel to the two slits in Young's double slit experiment. It is established that while an opaque screen is not mandatory, it simplifies the mathematics and enhances the symmetry of the experimental setup. If a transparent screen were used instead, the distinct fringes and light spots would be obscured by additional light, complicating the results.

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SAINATHAN
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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 the 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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