An aperture consisting of a single slit and a complementary strip (wire) is illuminated with a laser beam. The corresponding diffraction patterns are measured according to position and intensity with a photocell which can be shifted.
- surprisingly a slit and a wire show basically the same diffraction pattern
- measurements prove a theorem that sounds awkward at first glance
- sturdy setup allows good reproducability of results
- Determination of the intensity distribution of the diffraction patterns due to a slit and complementary strip (wire).
- Determination of the intensity relations of the diffraction pattern peaks for the single slit.
- Babinet's theorem is discussed using the diffraction patterns of the slit and the complementary strip.
What you can learn about
- Huygens' principle
- Fraunhofer und Fresnel diffraction
- Babinet's theorem
- Poissons' spot