lend=.5876 ;
lenF = .4861;
lenC = .6563 ; 
F2 = Glass; 
F2.SellmeierCoefficients  = [1.34533359E+00  2.09073176E-01  9.37357162E-01  9.97743871E-03  4.70450767E-02  1.11886764E+02];

N_BK7 = Glass; 
N_BK7.SellmeierCoefficients = [1.03961212E+00  2.31792344E-01  1.01046945E+00  6.00069867E-03  2.00179144E-02  1.03560653E+02];
ndF2 = F2.getRefractiveIndex(lend) %expected ans=1.62004
vdF2 = F2.getAbbeNumber(lenF,lend,lenC) %expected ans=36.37

ndN_BK7 = N_BK7.getRefractiveIndex(lend) %expected ans=1.5168
vdN_BK7 = N_BK7.getAbbeNumber(lenF,lend,lenC) %expected ans=64.17


