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Technical data


Rotation of the polarisation plane in a sugar solution

Article no: P1197700

Principle

Optically active substances such as sugar solution and quartz rotate the polarization plane of the Iight passing through them. The optical activity is brought about by the form of the sugar molecules in the sugar solution, or by the grid structure of the quartz.
The angle a, by which the polarization plane of Iight is rotated in a sugar solution, depends on the wavelength 7 of the light, the concentration c of the solution and on the Iayer thickness d (path travelled by the light in the solution).

This phenomenon is called rotational dispersion and we use it, for instance, to determine the concentration of optically active substances in solutions. The device used to determine in particular the concentration of sugar solutions is known as the saccharimeter. There are dextrorotatory (right-handed) and laevo-rotatory (left-handed) optically active substances. In this experiment the students should become familiar with the phenomenon of rotational dispersion, its dependence on c and d, and the basic design of a saccharimeter.

Benefits

  • Multifunctional light box - All-in-one: Can be used for geometric optics on the table, colour mixing and on an optical bench
  • Extension with others sets at anytime, no additional light sources needed, recognition value for students

Tasks

  1. Set up a mode) of a saccharimeter and investigate what happens to a sugar solution when polarized Iight of various wavelengths passes through it.
  2. Find out also, whether and to what extent the observed phenomenon is dependent on the layerthickness and concentration of the sugar solution.

Scope of delivery

Light box, halogen 12V/20 W 09801-00 1
Bottom with stem for light box 09802-20 1
Optical profile-bench for student experiments, l = 600 mm 08376-00 1
Colour filter set, additive (red, blue, green) 09807-00 1
Diaphragms, d 1, 2, 3, 5 mm 09815-00 1
Lens on slide mount, f=+50mm 09820-01 1
Lens on slide mount, f=+100mm 09820-02 1
Slide mount for optical bench 09822-00 2
Mount with scale on slide mount 09823-00 1
Table with stem 09824-00 1
Cuvette, double semicircular 09810-06 1
Screen, white, 150x150 mm 09826-00 1
Polarization filter, 50 mm x 50mm 08613-00 2
Diaphragm holder, attachable 11604-09 2
Beakers, Boro, low form, various sizes 46054-00 1
PHYWE Power supply, 230 V, DC: 0...12 V, 2 A / AC: 6 V, 12 V, 5 A 13506-93 1

PHYWE Systeme GmbH & Co. KG
Robert-Bosch-Breite 10 – 37079 Göttingen – Germany
www.phywe.com