I am doing some research involving geometric optics. I need to reduce an image in size so it fits a rotating mirror we are using.
I came up with the idea of projecting the focal plane on the mirror, since that would be very small. I could have used more lenses and projected the actual image on the mirror, however this image is later once again magnified in size and I want this image to have little to no distortion.
So yesterday I found that what I am looking at in my focal plane is actually the image of my light source. How is it possible that, even after the beam passes an 'object' (I used a resolution test chart), the light beam still has the information of the source 'encoded' in it, while only a fraction of the actual source passed through my object? How would one call this phenomenon (I'm having a hard time finding anything about this on the web)? And last of all: Would I need fewer lenses to reduce the image of my source in size if the source is a collimated beam?
To give some additional information: My setup consits now of, respectively: A source, an object, a 10x infinite corrected objective (these three to simulate a microscope), a lens, another lens a little distance away, and a CCD on which the image of the source is displayed. The CCD will be replaced by the small mirror at a later stage.
Might any additional information be required, please notify me and I will include it.
Thanks in advance,