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5 bytes removed ,  06:53, 2 June 2015
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==optics==
 
==optics==
**nature of light**
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**nature of light
##dual nature 1.1
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**dual nature  
 
## example 1.1.a
 
## example 1.1.a
 
## example 1.1.b
 
## example 1.1.b
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