- #1
fog37
- 1,568
- 108
Hello Forum,
Resolution is an angular distance (measured in fractions of an 1 degree angle). The lower the resolution the better. It represents the ability to distinguish two objects that are very closer to each other.
For an optical system, the resolution increases when the diameter D of the lens increases (or if the wavelength of the used light decreases).
1) If the system has multiple lenses, will the aperture pupil determine the resolution or the size of the aperture stop?
Because of the unavoidable diffraction, two object points will be imaged by a circular lens as Airy disks. If the two discs are too large they will overlap and look like a single blobby image: we will not be able to distinguish the two objects separately.
The two point images (Airy discs) form on the imaging screen that is often assumed to be continuous. What if the imaging screen is (like the human retina) discrete an formed by a finite number of photoreceptors with a certain size and shape?
Does the size of each receptor need to be smaller, larger or equal to the diameter of the Airy disks?
Thanks,
Fog37
Resolution is an angular distance (measured in fractions of an 1 degree angle). The lower the resolution the better. It represents the ability to distinguish two objects that are very closer to each other.
For an optical system, the resolution increases when the diameter D of the lens increases (or if the wavelength of the used light decreases).
1) If the system has multiple lenses, will the aperture pupil determine the resolution or the size of the aperture stop?
Because of the unavoidable diffraction, two object points will be imaged by a circular lens as Airy disks. If the two discs are too large they will overlap and look like a single blobby image: we will not be able to distinguish the two objects separately.
The two point images (Airy discs) form on the imaging screen that is often assumed to be continuous. What if the imaging screen is (like the human retina) discrete an formed by a finite number of photoreceptors with a certain size and shape?
Does the size of each receptor need to be smaller, larger or equal to the diameter of the Airy disks?
Thanks,
Fog37