What will a pinhole behind a pinhole do?
Can anyone tell me what will happen to the light rays if we setup a pinhole system like the following, will it simply crop the image?
Also what about a thick pinhole? Is the following correct, and will only let a small field of view in and project only a small area limited to the thickness of the pinhole?
What I wanted to do is project a very small spot from something like an LED light in a dark chamber into a very small spot, say ~2 microns, without resorting to an expensive or complicated optical setup, not the whole light, even just a portion of it is fine.
So I thought one of these two approaches, might be able to 'crop' the projected image down to ~2 microns.