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Himanshu (9616)

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DIFFRACTION-:
 
1)it occurs due to superpos. of secendary wavelets frm exposed part of a coharent source
2)inte3nsity of succesive bright fringes goes on dec.
3)intensity of dark fringes is never zero
4)diff. fringes are never of = width
 
5)conditions for max. are
 
a)path diff. delta.x= (2n+1)lamda/2
b)phase diff.         = (2n+1)lamda/2
c)time diff.            = (2n+1)T/2
 
6)conditions for minima are  
 
a) path diff. = n*lamda
b)phase diff.= 2n*pi
c)time diff.   =nT

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