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geometrical optics
focal lengths and principal planes

focal lengths of a spherical refracting surface ( free )

Fill in all input cells.
Choose all parameters unit.
n0 and n1 can be either values or references of glasses from the catalog. If values are directly entered, the wavelength will not be considered.
focal lengths and radius of curvature are algebric.
Positive direction is according the horizontal arrow in the bottom right of the scheme.

fto be calculated
fito be calculated
focal lengths of a spherical refracting surface
R : radius of curvature of the refracting surface n0 : refraction index of the first medium n1 : refraction index of the second medium f : front focal length fi : back focal length

This calculation page can not detect all unrealistic inputs.

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