Which of the given statements is/are correct for phenomenon of diff...

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Which of the given statements is/are correct for phenomenon of diffraction?

I. For diffraction through a single-slit, the wavelength of wave must be comparable to the size of the slit.
II. The diffraction is very common in sound waves but not so common in light waves.
III. Diffraction is only observed in electromagnetic waves.
(a) Only I
(b) II and III
(c) I and II
(d) I, II and III
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