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Old Nov 14th 2009, 11:04 AM   #21
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Being called "sir" isn't always about age. At least I don't believe so.
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Old Jan 25th 2010, 10:17 AM   #22
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You are correct that there is another path without glass rod. that is why i used the term 'extra wavelength: the path difference arising due to air will get cancelled during differentiation since it is a constant.
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