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7. (a) What changes will occur to the interference fringe in Young's double slit experiment when

(i) distance between the slits is reduced and (ii) the whole system is immersed into water?

Dear student
Using the formula Y=  λ​D/d
where D = distance from screen
d = distance between slits.
So fringe width will be increases

2)  On immersing the apparatus in a liquid(say water), the wavelength of  light decreases.
That is :-
 λ'=λμ            ..............(1)
As fringe width is calculated by:-
β=λD2d           ........(1)
Put value of λ=λ'μ in eq.(1):-
Now:- β'=λμ*D2d
That is fringe width decreases and hence becomes 1μ times of its value in air.


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