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Polarisation of light
•
Set up the experiment as shown in Figure 9.
•
Rotate the polarization filter around the optical
axis.
•
Observe the changes of intensity of the laser
beam spot on the screen.
Caution
No light is visible on the screen due to the perpen-
dicular direction of the polarizer axis and the E vec-
tor of laser light. However this does not mean that
your eyes are protected from the laser beam. Direct
eye contact with the laser beam can permanently
damage your sight.
Fig. 9 Demonstration of the polarizing properties of light (P
= polarization filter, M = ground screen)
Absorption of light
•
Set up the experiment as shown in Figure 10.
•
By using different colour filters observe the
changes in beam spot intensity.
Fig. 10 Demonstration of light absorption with colour
filters (F =colour filter, M = ground screen)
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