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20 Aug 2011 11:09:38 IST
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the initial shape of wave front of the beam is:1.)convex.2.)concave.3.)convex near the axis and concave near the periphery4.)planar
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20 Aug 2011 11:58:57 IST
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write the full question atleast , if i remember correctly this is something related to aieee 2010 and ans was 4)
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