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See for yourself by reading reviews on the most popular resources:
I find this program easy to use, but if I'm totally honest I searched on line how to fill PDF form not understanding that after filling the form in 4 hour ( very complicated licencing form) when I came to save it I had to pay did not think it was clear at the beginning of the process the cost implication as I'm doing this on behalf of a charity low on funds. Ian Patterson-Parke
2014-05-11
I had to cancel my subscription right after I got it (the first time) because we were told not electronic signatures. The customer service person I was connected to was very quick with applying my refund and explained the banks general policies. It ended up there was a mistake, so I'm back. I enjoyed the ease of using the product. I was able to pretty much teach myself how to use it. I do look forward to seeing what the webinar has to offer.
2018-03-09
I love this application. I work extensively with government forms for skilled nursing facilities. So far your program is the best for making the forms look professional and for ease of use!
2018-07-17
So simple to use
I regularly have the need to edit & sign documents & have used a few of the other free & paid services, PDF Filler has been great to work with so I renewed my subscription again..
I find importing a PDF easier than most other similar softwares... changing font sizes and styles is simple and the process is fast even on my slow internet service..
So far I have not had an issue with any of the features..
2019-09-18
Business Consultant
This is great to be able to complete a form while out of the office as well as to keep the office green.
The only drawback is that sometimes the area that you "filling" does not line up. Not really that big of deal though.
2019-02-11
Great customer service
Great customer service! Emailed pdfFiller and received a prompt response from Grace, who managed to resolve the issue within minutes!!
2022-05-22
Impressive customer service
I needed pdfFiller for one time use so subscribed and immediately cancelled my subscription when I had finished. A month later I was charged $96. I got in contact with their customer support team via the online live chat and within 2 minutes of contacting them the money was back in my paypal balance, no questions asked. Much easier than expected
2021-03-03
If you have forms to fill out electronically, this is the website to use. It is simple even for those not great with tech! Customer service is also very honest and helpful as far as billing, etc.
2021-01-20
It's great. Noticed some glitches on the forms, e.g. the text-in-th middle selection populates horizontally instead of vertically, making it impossible to see all that has been typed without scrolling across.
2025-02-24
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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 do we mean by 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.
What is meant by the resolution of a telescope?
The resolution, or resolving power, of a telescope is defined as being the minimum angular separation between two different objects which can be detected.
How do you find the diffraction limit of a telescope?
The diffraction limit is defined by the equation =1.22 /D, where is the angle you can resolve, is the wavelength of the light, and D is the diameter of your objective mirror (lens). The maximum resolution that can be achieved by any optical system is set by the diffraction limit.
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.
How does magnification affect resolution?
A simple answer is that resolution of an optical system is its ability to separate two closely spaced objects. Resolution In general as the magnification increases the resolution increases, however, this much more complicated than it seems.
What does resolution depend on?
The limit of resolution (or resolving power) is a measure of the ability of the objective lens to separate in the image adjacent details that are present in the object. The wavelength of light is an important factor in the resolution of a microscope. Shorter wavelengths yield higher resolution.
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