K20 - GOST Rus

Diagram n (λ)

n calculation

Analogue search

Main parameters
n_d = 1.526384 n_e = 1.528470	V_d = 60.15 V_e = 59.89	n_F - n_C = 0.008749 n_F' - n_C' = 0.008822

Type: Resnik
Spectral range: 0.36501 - 2.6 mkm.
C1 = 0.028 C2 = 1.52288 C3 = 0.0159647 C4 = -0.0101098 C5 = -0.00106009 C6 = -0.000181445 C7 = 0.00000877377 C8 = -0.0000561313 C9 = 0.000118438 C10 = 0 C11 = 0

Refraction index
n _2.3254	1.500047
n _1.9701	1.505053
n _1.5296	1.510393
n _1.06	1.515852
n _t	1.516464
n _s	1.518978
n _r	1.522199
n _C	1.523719
n _C'	1.524143
n _0.6328	1.524540
n _D	1.526306
n _d	1.526384
n _e	1.528470
n _F	1.532468
n _F'	1.532966
n _g	1.537212
n _h	1.541145
n _i	1.547895
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.8291
P_C,A'	0.3488
P_d,C	0.3045
P_e,C	0.5430
P_g,d	1.2375
P_g,F	0.5421
P_h,g	0.4495
P_i,g	1.2209
P_C',t	0.8776
P_e,C'	0.4945
P_F',e	0.5137
P_i,F'	1.7062

Density: 2.61 g/cm³
Poisson coef.: 0.221
Young module: 738 Pa*10⁸
Optical stress coef.: 3.1 1/Pa*10¹²
Abrasion: 1

Climatic resistance: А
Resistance to acids: I

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
-60 ~ 20	69
0 ~ 30	71
20 ~ 120	75
20 ~ 300	81