Rayleigh criterion (circular aperture) (θ ≈ 1.22 λ/D)
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θ ≈ 1.22 λ/D
What each symbol means
| Symbol | What it stands for |
|---|---|
| D | Diameter of circular aperture (m) |
| \theta | Minimum angular resolution (Rayleigh, rad) |
| \lambda | Wavelength (m) |
When to use this
Standard JEE / NCERT assumptions unless stated (paraxial, thin lens, coherent YDSE sources, etc.).