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What our customers say about pdfFiller
See for yourself by reading reviews on the most popular resources:
It's been very pleasant as a university student. One thing that is quite annoying is the scrolling feature - when I scroll on my macbook pro it doesn't really work well. Overall, this is perfect for annotating my lecture slides and readings. As a student, I find it a bit expensive ($72/year) - maybe there can be some incentive for students?? :)
2017-04-19
It is very convenient to use forms found on the internet and to create your own. Makes the trouble of scanning obsolete and signatures.... simply a breeze !
Highly recommended
2017-04-20
wonderful program
wonderful program, very helpful for me, I scanned in my document and am able to type it instead of handwriting it, as is the standard in my office. Saves me a ton of time.
2020-01-01
Need Email Ease
I would prefer to have the email document link a little easier to navigate. Maybe a big button with 2 steps to it so it isn’t accidentally sent?
2019-04-18
Great Product
Great Product. I work in a small office. This program is just enough to make great forms for applications and requests. It is easy to use and makes my documents look professional.
2022-03-30
It was tough,but I think I got through it. Nice to know that I can contact help if I need it. This might work better than Adobe verison. it's more affordable.
2021-09-27
Easy to use and looks very professional
It solves my simple requirements without spending on the expenses of a Designer. I love how it shows you step-by-step instructions on how to edit forms.
It is a great tool for anyone to use. No matter what type of company, school or type of work you do, you will find everything in this software. In addition, files are at your fingertips at any time with PDFfiller.
I don't have to complain about PDFfiller, because it is surprisingly this software, well worth the investment.
2020-08-27
Great experience when I used it when I…
Great experience when I used it when I had to switch over to my online college classes, but unfortunately, you cannot add some special characters such as the degree sign not can I put subscripts which I need for my chemistry class, but everything was on point!
2020-05-18
Having to make the check boxes into…
Having to make the check boxes into check marks instead of x takes while when you have twenty on the page. It would be nice if you could decide for the whole page.
2020-05-18
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What is diffraction limited resolution?
An optical system with the ability to produce images with angular resolution as good as the instrument's theoretical limit is said to be diffraction limited. The resolution of a given instrument is proportional to the size of its objective, and inversely proportional to the wavelength of the light being observed.
What is meant by the diffraction limited resolution of a telescope?
angular resolution. Ability of a telescope to distinguish between adjacent objects in the sky. Diffraction-limited resolution. Theoretical resolution that a telescope can have due to diffraction of light at the telescope's aperture. Depends on the wavelength of radiation and the diameter of the telescope's mirror.
What is the diffraction limit of a telescope?
What is the diffraction limit of a telescope? The minimum angular separation of two sources that can be distinguished by a telescope depends on the wavelength of the light being observed and the diameter of the telescope. This angle is called the DIFFRACTION LIMIT. In this equation, the computed angle is in radians.
What is meant by resolution of a telescope?
The angular resolving power (or resolution) of a telescope is the smallest angle between close objects that can be seen clearly to be separate. Resolution is limited by the wave nature of light.
What does diffraction limited mean?
Diffraction limit means that an imaging lens could not resolve two adjacent objects located closer than /2NA, where is the wavelength of light and NA is the numerical aperture of the lens. E.g. the resolution of optical imaging instruments, is fundamentally limited by the diffraction of light.
How does diffraction affect resolution?
Diffraction causes points of light which are close together to blur into a single spot: it sets a limit on the resolution with which one can see. If the light passes through a circular aperture.
Why do you think this limit of resolution is described as diffraction limited?
There are many situations in which diffraction limits the resolution. The acuity of our vision is limited because light passes through the pupil, the circular aperture of our eye. Be aware that the diffraction-like spreading of light is due to the limited diameter of a light beam, not the interaction with an aperture.
What does it mean to be diffraction limited?
An optical system with the ability to produce images with angular resolution as good as the instrument's theoretical limit is said to be diffraction limited. The resolution of a given instrument is proportional to the size of its objective, and inversely proportional to the wavelength of the light being observed.
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