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physical optics
two waves interferences


radius of dark ring fringe observed in the focal plane of a lens


Caution
Fill in all input cells.
Choose all parameters unit.
The plate material is supposed to be a dielectric. Consequently there is an air/glass and a glass/air reflection introducing an additionnal phase shift of p.
n can be either a value or the reference of a glass from the catalog.
All parameters are positive.

InputValueunit
lam
e
n
fi
k
OutputValueUnit
Rkto be calculated
radius of dark ring fringe observed in the focal plane of a lens
lam : wavelength e : interferometer thickness n : refraction index of the interferometer fi : effective focal length of the observation lens k : dark fringe number ( counted from the center ) Rk : dark fringe radius in the back focal plane of the observation lens

Note
This calculation page can not detect all unrealistic inputs.



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