14.
Rayleigh's criteria for a rough surface is: (where letters carry their usual meanings).

15.
Which one of the following relationship between the wave length ($$\lambda $$) and frequency and the speed (C) of the electromagnetic wave is correct?

17.
According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n1) on another medium (refractive index n2);

19.
Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its