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geometrical optics
focal lengths and principal planes

thick lens

Fill in all input cells.
Choose all parameters unit.
n can be either a value or the reference of a glass from the catalog. If a value is directly entered, the wavelength will not be considered.
e is positive.
Raddii and x are algebric or infinite. Enter "infinite" for a plane surface or an object at infinity.
Positive direction is according the horizontal arrow in the bottom right of the scheme.

fito be calculated
lto be calculated
lito be calculated
Lto be calculated
ftto be calculated
fbto be calculated
thick lens
n : refraction index R1 : radius of curvature of the first surface R2 : radius of curvature of the second surface e : center thickness fi : effective focal length l : distance from the vertex of the first surface to the primary principal plane li : distance from the vertex of the second surface to the secondary principal plane L : distance from the primary principal plane to the secondary principal plane ft : front focal length fb : back focal length

This calculation page can not detect all unrealistic inputs.

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