A laser beam is shone onto a variable rectangular aperture. The size of the hole determines the type of diffraction produces on the screen. Very small apertures produce Fraunhofer diffraction, and ...

(An easy way is to fold the foil square in half, then fold it in half again ... Hold the spectroscope so that you can look through the diffraction grating end. Point the slit end of the spectroscope ...

the resulting diffraction pattern is similar to the diffraction pattern of a slit of the same width as the object, in agreement with the Babinet's principle. The only difference is that the centre of ...