Ideal Spherical Lens

[carlabarato]

Sphericallens are not fit to practice the lensmaker's equation: 1/focal length = (refractive index -1)*(1/R1 - 1/R2)
I would like a new kind of Sphericallens, type named as IdealSphericallens, in order to simulate the lensmaker's equation.
Simulation and representation would be the same as ideallens. The only change would be on parameters input entries: n=refractive index; R1= curve radius for the left surface; R2= curve radius for the right surface. Focal length can be calculated internally using lensmaker's equation.
This could be a new item at Glasses menu labeled as: Ideal Spherical Lens.