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geometrical optics
focal lengths and principal planes


thin lens ( free )


Caution
Fill in all cells except one.
Choose all parameters unit.
n can be either a value or the reference of a glass from the catalog. If a value is entered, the wavelength will not be considered.
Except n which is positive, all parameters are algebric.
Positive direction is according the horizontal arrow in the bottom right of the scheme.

ParameterValueunit
n
R1
R2
fi
 thin lens
n : refraction index R1 : radius of curvature of the first surface R2 : radius of curvature of the second surface fi : effective focal length

Note
This calculation page can not detect all unrealistic inputs.



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