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what will happen to the fringe width in fresnel’s biprism if it’s immersed in water and why?/

what will happen to the fringe width in fresnel’s biprism if it’s immersed in water and why?/
               

Grade:12th pass

1 Answers

Arun
25763 Points
3 years ago
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
             =β/μ'
That is fringe width decreases and hence becomes 1μ times of its value in air. 

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