Question

The class of diffraction in which the incident and diffracted wave fronts are spherical is called

• A. Fraunhofer diffraction
• B. Fresnel diffraction
• C. Huygens' diffraction
• D. Newton's diffraction

Answer 1

Answer: (B)

Fresnel diffraction

The Fresnel diffraction equation for near field diffraction, is an approximation of kirchhoff - Fresnel diffraction that can be applied to the propagation of waves in the near field.
In the near field the wave fronts are spherical being emitted from a point source.