TV aerials
The rods on TV aerials ar always horizontal. This is because TV signals are polarised by the orientation of the rods o the broadcasting aerial. To recieve a strong signla, the receiving aerial has to have rods that are lined up with the rods on the transmitting aerial.
Communication satellites
These use different polarisations for signals in the same frequency band to reduce the amoutn fo interference between the signals.
CD players
A polarising crystal is used to transmit light polarised in one direction, and reflect light polarised in any other direction.
Photography
Polarising lenses are used to remove unwanted reflections in pictures taken.
Nature
Bees use polarised light to navigate, so they can direct other bees back at the hive to a good pollen spot they found.
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