In YDSE there is presence of dark and bright fringe
In actual or real world there no such appear to us why??

Dear student,

If we need to observe the dark and bright fringes,
1)The light need to interact with very small objects or very sharp edges.
2)The light should be monochromatic.
3)The rays that are interacting should be coherent.

But in real world,we mostly see sun light which is not monochromatic,the rays are not perfectly coherent and we do not see perfect sharp edges.In some incidents,we can see the fringes but they are blurred.To observe clear fringes,the above conditions should meet.This is why in actual world,there is no such appearance.


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