1.

Conditions of diffraction is                                          [RPET 2001]

A.            \[\frac{a}{\lambda }=1\] 
B.            \[\frac{a}{\lambda }>>1\]
C.            \[\frac{a}{\lambda }<<1\]      
D.            None of these
Answer» B.            \[\frac{a}{\lambda }>>1\]


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