I wonder can a sustained interference pattern be obtained in Young double slit experiment if we do not use single slit between source of light and the double slits when one has a monochromatic source in the experiment.
First of all thank you for giving your precious time for the reply.You need a source of coherent light. The single slit is by far the cheapest, easiest, and lowest-tech coherent light source, but any coherent light source will do.
Can a(single) pure monochromatic source(without single slit) act as coherent source?Interference always occurs but to make it visible you need a coherent source.
If the source the result is a superposition of interference patterns in which the intensity variation is erased.
Well I guess it COULD, but there is no reason to assume that it does in any particular case. Coherent is more restrictive than monochromatic. Do you understand the definitions of the terms?It appears as he was asking that Could a pure monochromatic source amount to a coherent source?
OK what about this(image below)? Only two openings(two slits) on a monochromatic source.Such a source lacks spatial coherence and can be seen as a superposition of spatially coherent sources (think of your source as consisting of adjacent slits). You will observe the interference patterns of each of these slits superimposed on each other. This will erase the characteristics of the individual interference patterns
I disagree, anything is possible. It completely depends on how each of the openings is illuminated. The picture contains no information on this.Yes. The light emitted from each slit will interfere and form an interference pattern on the screen.
Yes. The light emitted from each slit will interfere and form an interference pattern on the screen.
Here are the things hooking up. I fail to get a common answer, people even in my Institute are telling different answers without giving a descriptive answer for their "yes" and "no" and I have my own thoughts on "yes" and "no" for the above question. Which if cleared sufficed the purpose of the thread. And I am here just to clear the doubt and I feel as opposed to philosophy where disagreements at a subject are allowed, physics is an exact science, answers with disagreements needs to consider again.I disagree, anything is possible.
And how does this tie into the example given by the OP?A monochromatic source is temporally coherent but not necessarily spatially coherent.
For the latter, light from different directions also has to have a phase relation.
If monochromatic light comes from a diffuse scatterer, such a phase relation is lost.