This experiment will demonstrate the wave nature of the light by observing diffraction and interference of a laser light passing through a single slit and double slits, respectively.
If the difference between the phases is intermediate between these two extremes, then the magnitude of the displacement of the summed waves lies between the minimum and maximum values.
Turn off the room light, and observe the light pattern on the wall on the other side of the foil. Interference and Diffraction.
A shadow of a solid object, using light from a compact source, shows small fringes near its edges. Note that the central maximum is larger than those on either side, and that the intensity decreases rapidly on either side.
As physical objects have wave-like properties at the atomic leveldiffraction also occurs with matter and can be studied according to the principles of quantum mechanics. Next, stack three razor blades such that the middle blade is recessed.
Note that the central bright fringe is approximately twice as wide in the y-direction as the other bright fringes which are about the same in widthand the over intensity of the bright fringes decay away from the center along the y-axis, as expected for the single slit diffraction pattern.
This is indeed the diffraction pattern due to each of the narrow slits.