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  • In the set up shown in Fig the two slits, and <img alt="\mathrm{S_2}" src="https://entrancecorner

In the set up shown in Fig the two slits, \mathrm{S_1} and \mathrm{S_2} are not equidistant from the slit S. The central fringe at O is then

 

 

Option: 1

Always bright .


Option: 2

Always dark


Option: 3

Either dark or bright depending on the position of S


Option: 4

Neither dark nor bright


Answers (1)

best_answer

If path difference \mathrm{\Delta=\left(S S_1+S_1 O\right)-\left(S S_2+S_2 O\right)=n \lambda n=0,1,2,3, \ldots} the central fringe at O is a bright fringe and if the path difference \mathrm{\Delta=\left(n-\frac{1}{2}\right) \lambda, n=1,2,3, \ldots .}. the central bright fringe will be a dark fringe.

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Ritika Harsh

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