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!
We don't have to …
but it makes the maths easier, and the picture more symmetric and prettier.
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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