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2. Magnifying glass - Wikipedia

   en.wikipedia.org/wiki/Magnifying_glass

   Magnifying glasses typically have low magnifying power: 2×–6×, with the lower-power types being much more common. At higher magnifications, the image quality of a simple magnifying glass becomes poor due to optical aberrations, particularly spherical aberration. When more magnification or a better image is required, other types of hand ...

3. Coddington magnifier - Wikipedia

   en.wikipedia.org/wiki/Coddington_magnifier

   A Coddington magnifier is a magnifying glass consisting of a single very thick lens with a central deep groove diaphragm at the equator, thus limiting the rays to those close to the axis, which minimizes spherical aberration. This allows for greater magnification than a conventional magnifying glass, typically 10× up to 20×. Most single lens ...

4. Objective (optics) - Wikipedia

   en.wikipedia.org/wiki/Objective_(optics)

   One of the most important properties of microscope objectives is their magnification.The magnification typically ranges from 4× to 100×. It is combined with the magnification of the eyepiece to determine the overall magnification of the microscope; a 4× objective with a 10× eyepiece produces an image that is 40 times the size of the object.

5. Magnification - Wikipedia

   en.wikipedia.org/wiki/Magnification

   In this case the angular magnification is independent from the distance kept between the eye and the magnifying glass. If instead the lens is held very close to the eye and the object is placed closer to the lens than its focal point so that the observer focuses on the near point, a larger angular magnification can be obtained, approaching

6. Optical instrument - Wikipedia

   en.wikipedia.org/wiki/Optical_instrument

   The first optical instruments were telescopes used for magnification of distant images, and microscopes used for magnifying very tiny images. Since the days of Galileo and Van Leeuwenhoek, these instruments have been greatly improved and extended into other portions of the electromagnetic spectrum.

7. 'Makes a HUGE difference': If you struggle to see small print ...

   www.aol.com/lifestyle/magnipros-book-magnifier...

   Conquer even the smallest type with this handy gadget — complete with a light that allows you to read in bed without irking your spouse.