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