BF26 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.650549 n_e = 1.654559	V_d = 38.47 V_e = 38.19	n_F - n_C = 0.016909 n_F' - n_C' = 0.017137

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.65404 C3 = 0.0329799 C4 = -0.00911976 C5 = -0.000180405 C6 = -0.000211079 C7 = 0.000201331 C8 = 0.0000143932 C9 = 0.000126369 C10 = 0 C11 = 0

Refraction index
n _2.3254	1.615603
n _1.9701	1.620398
n _1.5296	1.625857
n _1.06	1.632551
n _t	1.633427
n _s	1.637314
n _r	1.642828
n _C	1.645575
n _C'	1.646355
n _0.6328	1.647088
n _D	1.650401
n _d	1.650549
n _e	1.654559
n _F	1.662485
n _F'	1.663492
n _g	1.672289
n _h	1.680762
n _i	1.696059
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.7184
P_C,A'	0.3212
P_d,C	0.2941
P_e,C	0.5312
P_g,d	1.2856
P_g,F	0.5797
P_h,g	0.5010
P_i,g	1.4057
P_C',t	0.7645
P_e,C'	0.4851
P_F',e	0.5282
P_i,F'	1.9259

Density: 3.86 g/cm³
Poisson coef.: 0.246
Young module: 682 Pa*10⁸
Optical stress coef.: 2.4 1/Pa*10¹²
Abrasion: 0.9

Climatic resistance: А
Resistance to acids: I

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	63
0 ~ 30	66
20 ~ 120	70
20 ~ 300	77