Eikonal approximation Kichhoff

Geometric optics)

• 1 Informal description
• 2 Relation to the WKB approximation
• 3 Formal description

• 1 Derivation of Kirchhoff's diffraction formula
  • 1.1 Point source
    • 1.1.1 Equivalence to Huygens–Fresnel equation
  • 1.2 Extended source
• 2 Fraunhofer and Fresnel diffraction equations
  • 2.1 Fraunhofer diffraction
  • 2.2 Fresnel diffraction
• 3 References
• 4 Further reading