Recent content by alikazemi7

this is my question: when monochromatic light emits on a screen without passing from a slit/slits we don't see interference patterns. why the spherical waves on the wave front don't interfere with each other in this situation?

but in diffraction phenomenon in which we have a single slit and of course one source, the wave interfere with itself and we see interference pattern.

so according to what principles we see interference patterns when a wave pass through a slit or grating?

Hi according to Huygens principle every point on the wave front acts as a spherical source. so if a we emit monochromatic light on a screen without passing light from grating, we should see interference pattern but we don't. why don't these spherical waves interfere with each other? is this...

Hi https://en.wikipedia.org/wiki/Mathematical_descriptions_of_opacity it is mentioned above that "in non attenuating media, the refractive index and angular wavenumber are related by: A complex refractive index can therefore be defined in terms of the complex angular wavenumber defined...

Hi 1)Does refractive index varies when we are dealing with different waves? for example the refractive index for a typical glass is 1.5 when a visible light passes through it. Does it the same for x rays? 2) there is a complex formula which describes the refractive index: n = 1- δ - iβ. how is...

Thanks for your answers.about the second question for example an station wants to broadcast radio waves. I want to know do they calculate how far from the emitter the wave can be received? and is it possible to stop electromagnetic wave completely?

Hi 1)Is this sentence right? When we say for example the wavelength of red light in vacuum is 750 nm it means that the length of electric field and magnetic field that are perpendicular in the propagation direction of wave is 750 nm in one cycle? 2) We say that oscillating charges in antenna...