The Basic Principle Of The Ri Detector 2300/2400; Snell's Law (Of The Refractive Index) - Knauer Smartline 2300 Benutzerhandbuch

The Basic Principle of the RI Detector 2300/2400

Snell's Law (of the refractive index)

Formula 1 Snell's Law
Fig. 2
α
sin
= =
c n
1 1
α
c n
sin
2
2
With α : angle of incidence
1
α : angle of refraction
2
c : speed of light in medium 1
1
c : speed of light in medium 2
2
n : refractive index medium 1
1
n : refractive index medium 2
2
n: relative refractive index
Refraction of light at the transition from medium 1 to medium 2
Snell's law says that at the transition from one medium to another the
light is refracted depending on the particular speeds of light and the angle
of incidence. At the transition from a medium with lower optical density to
a medium with higher optical density the light is refracted towards the
perpendicular (lower angle between refracted ray and perpendicular than
between incident ray and perpendicular). At the transition from a medium
with higher optical density to a medium with lower optical density the light
is refracted away from the perpendicular (higher angle between refracted
ray and perpendicular than between incident ray and perpendicular).
The speed of light in a medium depends on the wavelength of the light
and the density of the medium. Normally, in an RI detector, the
wavelength is constant. The density depends on the temperature,
pressure and composition of the medium.
=
n
1
2
5