THE INTERFERENCE OF LIGHT WAVES FOR THE COURSE OF PHYSICAL OPTICS
The present work contains offers on change of the sequence of presentation of materials in comparison with a traditional course of physics, as well as with a physics course in which the nonconventional scheme of a presentation of material is used.
The following points are considered:
-a general approach to the analysis of the phenomena connected with wave processes (an interference, diffraction, polarization), and also separate illustrations (Jung's test, an interference in thin films, Newton's rings, etc.);
- the general case of addition of the monochromatic plane waves extending in the same direction with the changing amplitudes and phases (amplitude of waves decreases from a wave to wave with a constant coefficient k (k < 1));
- result of addition of the waves extending in the same direction with an identical amplitude and frequencies (in this case the positions of not only the main maxima, but of collateral maxima are determined);
- problem of fulfillment of a condition of coherence of interfering vibrations (the ∆ l_0 value, which is called as “coherence length”, and ∆ τ_0, which is called as “coherence time”, are introduced.
It is marked that the increase in brightness of interferential bands because of increase in the sizes of a source (slot width) leads to reduction of the sizes of an interferential field at a choice of the demanded conditions for supervision of an interference.
Interferential pictures are compared in the case of a dual-beam interference and a multi-beam interference.