Principle

The angle of rotation of the polarisation- plane of plane
polarised light through a flint glass rod is found to be a linear
function of the product of the mean flux-densitiy and the length of
the optical medium. The factor of proportionally, called Verdet’s
constant, is investigated as a function of the wavelength and the
optical medium.

Benefits


experience that magnetic fields can influence light by changing ist polarization properties

learn how wavelength and the optical medium influence the effect of the magnetic field

discover a bridge between the fields of optics and electromagnetism



Tasks


To determine the magnetic flux-densitiy between the pole pieces
using the axial Hall probe of the teslameter for different coil
currents. The mean flux-density is calculated by numerical
integration and the ratio maximum flux-density over mean
flux-density established.

To measure the maximum flux- density as a function of the coil
current and to establish the relationship between mean flux-density
and coil current anticipating that the ratio found under 1. remains
constant.

To determine the angle of rotation as a function of the mean
fluxdensity using different colour filters. To calculate the
corresponding Verdet’s constant in each case.

To evaluate Verdet’s constant as a function of the
wavelength.


What you can learn about


Electromagnetic field interaction

Electron oscillation

Electromagnetism

Polarisation

Verdet’s constant

Hall effect