Discussion
The phenomenon of diffraction is most significant when the slit width is
Answer: C
Diffraction is most significant when the slit width is comparable to the wavelength.
The angular spread of the central maximum is about \(\frac{\lambda}{a}\). When the slit width a is close to \(\lambda\), the light spreads into a broad, clearly visible pattern. When the slit is much wider than \(\lambda\), the spreading is negligible and light travels nearly in straight lines.
When the slit is much narrower than \(\lambda\), so little light passes that no useful pattern forms. The screen distance and independence from wavelength have nothing to do with how strongly light diffracts.
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