Polarisation of electromagnetic waves?

AI Thread Summary
Polarization of electromagnetic waves involves restricting the oscillations of the wave to a specific direction. It affects how waves interact with materials and can enhance signal clarity in communication technologies. Waves can be polarized using filters or reflection, and indicators of polarization include the orientation of light and its intensity. Unpolarizing a wave typically involves passing it through multiple polarizers or scattering it. Understanding these concepts is crucial for academic success in physics exams.
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I have an a-level exam tomorrow which is really important in deciding whether I can get into uni or not. So basically I am having a panic moment. Could you PLEASE tell me how you polarize electro-magnetic waves? What is the effect of polarization? Why do we polarize waves? How can you tell if a wave is polarized? How can you unpolarize a wave?

Sorry if that's to much. Thanks in advance.
 
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yes good luck
 
thanks very much
 
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