[RPET 2001]
A) $ \frac{a}{\lambda }=1 $
B) $ \frac{a}{\lambda }»1 $
C) $ \frac{a}{\lambda }«1 $
D) None of these
Correct Answer: A
For diffraction, the size of the obstacle must be of the order of the wavelength of the wave $ i.e. $
$ a\approx \lambda $
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