Werbung
Verfügbare Sprachen
Verfügbare Sprachen
7. Calculation of the Dispersion / 8. Special Instructions
8. Special Instructions
30
Example for calculation the value of dispersion:
Measured refractive index nD = 1.4827
Values on the scale of compensation knob:
1st position
42.3
42.2
42.2
42.2
---------------------------------
meanvalue Z = 42.2
Calculation:
nD
= 1.4827 (measured)
Z
= 42.2 (meanvalue)
A
= 0.024265 (from table)
B
= 0.024670 (from table)
a
= - 0.5962 (from table)
B x a
= - 0.014708
nF - nC = A + B x a
= 0.009557
n
-
D
1
V =
n
n
-
F
► The contrast of the light/dark area is less if the sample is
cloudy or coloured. In this case the measurement must be
done with reflected light as described for solid samples.
► When a colloid solution is used one must make sure that the
colloids are finely and homogenously distributed in the solu-
tion otherwise the dividing line will appear to be blurred.
2nd position
42.2
42.1
42.3
42.2
0.4827
=
0.009557
C
= 50.5
Werbung
Kapitel
Fehlerbehebung
