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?/
Dipon , 8 Years ago
Grade 12th pass
Wave Optics> what will happen to the fringe width in f...
1 Answers
Arun
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.
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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