Description

Students can investigate the relationship between
the proportion of transmitted light and the angle
of rotation of two polarising filters. A graduated
cartridge containing two polarising filters allows
students to observe the change in intensity as
they are rotated relative to one another. The
analyser allows quantitative readings to be taken
using a voltmeter at five degree intervals as the
polarising filters are rotated from minimum to
maximum transmission.
The output from the analyser changes linearly
with light intensity and so the resulting data can
be used to verify Malus’s law.