Caution
Fill in all input cells.
Choose all parameters unit.
refraction indexes can be either numeric values (larger than or equal to 1) or references of glasses from the catalog. If references of glasses are selected, the calculation considers the refraction indexes of these glasses at the generic wavelength lam defined in the page accessible by the general parameters/wavelength link.
e is positive or null.
Raddii are algebraic or infinite. Enter "infinite" for a plane surface.
x is algebraic.
Positive direction is according to the sense of the horizontal arrow provided for this purpose..