explain condition of interference for optical wave and differentiate between interference due to division of wavefront and division of amplitude giving one example of each
Answers
condition of interference-
I think it is best not to use the word interference to refer to a process. The underlying process is superposition. An interference pattern is what can be observed under certain conditions. Treating light as classical waves - we can say that they always superpose when they are in the same location. The effect is usually not noticeable. To get an observable interference pattern you nedd one which is large enough in scale and stable over time. It would beasy to have a pattern which is far too small to see and /or to have pattern which changes millions of times per second so that we would just see an averaged out effect. The conditions for the satble pattern are usually quoted as being same frequency and coherent. same frequency and in phase is the obvious way but any fixed (ie unchanging) phase relationship between the two sources of light will suffice. The easy way to obtain the coherent light sources is to use a single source and two slits. The light passing through the two slits will be coherent.
i am not sure about the 2nd ans