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20 bytes added ,  06:50, 2 June 2015
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==optics==
 
==optics==
 
**nature of light**
 
**nature of light**
 +
##dual nature 1.1##
 
==nature of light==
 
==nature of light==
 
==light as particle==
 
==light as particle==
 
==light as wave==
 
==light as wave==
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