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in some problems we use n2/n1= (poa- pa)/poa but in some other cases we use n2/n1= (poa-pa)/pa how to identify which one to use??? |
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Answer» in some problems we use n2/n1= (poa- pa)/poa but in some other cases we use n2/n1= (poa-pa)/pa how to identify which one to use??? |
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