A) \[\frac{a}{\lambda }=1\]
B) \[\frac{a}{\lambda }>>1\]
C) \[\frac{a}{\lambda }<<1\]
D) None of these
Correct Answer: A
Solution :
For diffraction size of the obstacle must be of the order of wavelength of wave \[i.e.\] \[a\approx \lambda \]
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