We can write the condition for minimum interference as
where h is the thickness of the wedge, m is the number of dark interterence fringes
Using (1) we got
θ is the angle between the plates in radians (this angle is small, so \tan {θ} = θ in radians).
In this case, we got
Using (3) we got
We put (4) in (2)
We got
In our case, we have θ=1.46×10-4, n=1.47, λ=582 nm
The number of dark interterence fringes per cm of the wedge length is equal to
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