An image, or image point or region, is in focus if light from object points is converged almost as much as possible in the image, and out of focus if light is not well converged. The border between these is sometimes defined using a "circle of confusion" criterion.

What is thefocallength of alensPhysics

The Mag Light app has become an indispensable tool in my daily life. Its versatility and functionality are truly impressive. Whether I’m trying to read the small print on medicine bottles or capturing detailed, up-close photographs, this app never disappoints.One of the standout features is its powerful magnification, which makes reading tiny text effortless. No more squinting or struggling to decipher labels – the Mag Light app brings clarity to even the smallest print.Additionally, the app’s ability to enhance close-up photography is remarkable. The level of detail it captures is perfect for documenting intricate objects or capturing the beauty of nature up close. The built-in light feature ensures that every shot is well-lit and clear, making it a fantastic tool for both casual and professional photographers.Overall, the Mag Light app is a must-have for anyone looking to simplify their life and enhance their photography skills. It’s reliable, easy to use, and incredibly effective. Highly recommended

Diverging (negative) lenses and convex mirrors do not focus a collimated beam to a point. Instead, the focus is the point from which the light appears to be emanating, after it travels through the lens or reflects from the mirror. A convex parabolic mirror will reflect a beam of collimated light to make it appear as if it were radiating from the focal point, or conversely, reflect rays directed toward the focus as a collimated beam. A convex elliptical mirror will reflect light directed towards one focus as if it were radiating from the other focus, both of which are behind the mirror. A convex hyperbolic mirror will reflect rays emanating from the focal point in front of the mirror as if they were emanating from the focal point behind the mirror. Conversely, it can focus rays directed at the focal point that is behind the mirror towards the focal point that is in front of the mirror as in a Cassegrain telescope.

Lens focal pointformula

This is a fabulous app for looking at minuscule details of something & for photographing them too. Only problem - when google ads appear at the bottom of the screen, they disallow your from being able to press/click the photo button. And forget alternatives, they don’t work either: (1) the frame doesn’t rotate to reposition to get away from the ad to make the button visible again either; (2) you can’t press the left side click button to photograph it either. So instead, you have to wait an interminable length of time - until whenever, for however long, for the ad to disappear, because there’s no “X” or “close” button to delete the ad from the screen. Very frustrating, especially when you’re right in the middle of doing something.

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In geometrical optics, a focus, also called an image point, is a point where light rays originating from a point on the object converge.[1] Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle. This non-ideal focusing may be caused by aberrations of the imaging optics. Even in the absence of aberrations, the smallest possible blur circle is the Airy disc caused by diffraction from the optical system's aperture; diffraction is the ultimate limit to the light focusing ability of any optical system. Aberrations tend to worsen as the aperture diameter increases, while the Airy circle is smallest for large apertures.

- Added Macro Photography Capability for supported iOS devices (e.g iPhone 13 Pro, iPhone 13 Pro Max or later iPhone Pro/Max)- bug fixes and performance improvements- improved image stabilization

The developer, Falcon In Motion LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

"Why we like it: It’s incredibly handy! There will always be a time where the menu writing is too small or the room is just too dark – this magnifying app will be just what you need." - appsmitten.com "This free app comes in handy when you find yourself in a dimly lit restaurant, squinting at tiny print on your menu. Point your iPhone's camera at the text, move the on-screen slider, and you'll have large, easy-to-read text in no time." -programming4.us -----------------------------------------------Have you ever experienced the following scenarios:need to read menu in a dim light restaurant ,need to read fine print on the medicine bottle,need to read book in bed after take reading glasses off,need to walk back to camp site in the dark night, need to check your makeup on your way to work,...You may need Magnifying Glass With Light, a overall 4.5/5.0 rated app in US market which could transform your iPhone or iPad into a FULL SCREEN lighted magnifying glass! Simple yet powerful!-----------------------------------------------FREE FEATURES: •Light Level Control•Image Capture •Auto-Focus Lock •Universal App for both iPhone and iPad •Pinch to Zoom In/Out. •Support Both Portrait or Landscape Orientation •Auto turn on built-in light in low light condition when start-up •Shake to hide/show all control buttons. •Support Front Camera •Full Screen User Interface •Magnify from 1.0X - 5.0X •Lighted View ------------------------------------------------------- Pro Version Additional Features (Via In-App Purchase):•(New!) Image Stabilizer•Crystal Clear Mode.•High Contrast Mode. •Tap Center to (Un)Freeze Image. •Enhanced Freeze: be able to move,drag, photograph the frozen image•Save Photo to Exclusive Photo Album -------------------------------------------------------FAQ:Q: Why not just using Apple's Camera app?A: In Camera app, you choose either digital zooming (Camera Mode) or Lighting (Video Mode), not both of them. Also this app has more features and larger zooming capability up to 6x. ------------------------------------------------------Notes: -Some features are only available in Pro version, upgrade is available through In-app Purchase.

I purchased the pro version of this many years ago and after I upgraded to iPhone 15, the zoom stopped working. I can no longer get clear details on super close up like beforeWhen I checked today for an update, I saw an exact app except it’s Magnifying instead of Mag on the title. The settings and details of the app are exactly the same except for the version (3.8.5 vs pro 3.5). The developers are the same (falconinmotion). I’m not able to restore my purchase and send feedback link on the pro version doesn’t work. Can someone please let me know how I can restore my purchase for this new version which actually solved the close up issue on iPhone 15. Thanks!