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Caution Fill in all cells except the one corresponding to the parameter to be calculated. Choose all parameters unit. n0 and n1 can be either numeric values 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. Angles are algebraic. Angle positive way is counterclockwise according to the round arrow provided for this purpose.