A) should be of the same order as wavelength
B) should be much larger than the wavelength
C) have no relation with wavelength
D) should be exactly
Correct Answer: A
Solution :
Diffraction refers to various phenomenon associated with wave propagation, such as bending spreading and interference of waves emerging from an aperture. It occurs with any type of wave, including sound waves, water waves etc. While diffraction always occurs, its effects are generally only noticeable for waves where the wavelength is on the order of the feature size of the diffracting objects or apertures.
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