gen-in-3-4-sentences-explain-diffraction-at-small-apertures-stat-afda

In 3-4 sentences, explain diffraction at small apertures. State any key formula.

# Diffraction at Small Apertures When light passes through a small aperture (opening comparable to its wavelength), it spreads out rather than traveling in straight lines, creating a characteristic pattern of bright and dark regions. This phenomenon occurs because different portions of the wavefront interfere with each other after passing through the opening. For a single slit of width *a*, the angular positions of dark fringes follow: $$a \sin\theta = m\lambda$$ where *m* = ±1, ±2, ±3... (order number), *λ* is the wavelength, and *θ* is the angle from the central axis. The central bright fringe is twice as wide as the other bright fringes, and the pattern becomes more pronounced as the aperture size approaches the wavelength of light.