http://digfir-published.macmillanusa.com/contpractv2/properties_of_light_waves_copy.html
Chapter
9. Properties of Light Waves
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http://digfir-published.macmillanusa.com/contpractv2/properties_of_light_waves_copy_dlap.xmlDLAP questions58be7cc47894d2dd4c000000