eHow launches Android app: Get the best of eHow on the go.
There are generally two types of microscopes: stereo and compound microscopes. Stereo microscopes are low-powered in comparison and can enhance objects 10-40X. It is a great microscope for looking at rocks, insects and flowers, while compound microscopes are better for seeing very small things on prepared slides. more »
Optic lenses are substances that allow light to pass through them while manipulating its density or its trajectory. They are typically made from glass or plastic, but can be constructed from any material that is clear enough to allow at least some light to pass through it. The purpose of optics is to either project an image onto a... more »
Anton van Leeuwenhoek (1632 to 1723) was a Dutch cloth merchant who made literally hundreds of microscopes. Although compound lenses were invented at that time, they were not yet perfected, and so Leeuwenhoek's microscopes all worked based on a more simple magnification system. Leeuwenhoek's skill as a lens grinder was essential to... more »
Camera filters are optical elements added to the front of your lens to create special effects or otherwise alter the lighting of a shot. Before digital cameras and computer photo tools were invented, filters were the primary special-effects tool for photographers.
Filters still have their uses for the digital photographer. UV... more »
When using a single-lens reflex (SLR) camera, different lenses can be attached to the camera body to take different types of photos. A macro zoom lens is a less expensive version of a true macro lens, used to take extremely close-up images on an SLR camera. Standard macro lenses are usually the tool of a professional photographer as... more »
"Magnification ratio" is a technical term in photography. Such ratios are based on size comparisons between real-life subjects and how they are... more »
A rifle scope is far superior to the iron sights that come on a rifle for shooting at any appreciable distance. The magnification power of the... more »
When you import a clip into Premiere Pro and attempt to view it in the Source or Program Monitor, it will automatically be scaled to fit into the... more »
You determine the magnification power of a telescope from the focal length of the eyepiece and the focal length of the telescope. The eyepiece in... more »
Mil dot rifle scopes are accurate tools for measuring distance without the need for lasers, multiple measurements or complicated math. To... more »
Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called magnification. When this number is less than one it refers to a reduction in size, sometimes called minification or de-magnification.
Typically magnification is related to scaling up visuals or images to be able to see more detail, increasing resolution, using optics, printing techniques, or digital processing. In all cases, the magnification of the image does not change the perspective of the image.
Magnification as a number (optical magnification)
Optical magnification is the ratio between the apparent size of an object (or its size in an image) and its true size, and thus it is a dimensionless number.
* Linear or transverse magnification — For real images, such as images projected on a screen, size means a linear dimension (measured, for example, in millimeters or inches).
* Angular magnification — For optical instruments with an eyepiece, the linear dimension of the image seen in the eyepiece (virtual image in infinite distance) cannot be given, thus size means the angle subtended by the object at the focal point (angular size). Strictly speaking, one should take the tangent of that angle (in practice, this makes a difference only if the angle is larger than a few degrees). Thus, angular magnification is defined as
::\mathrm{MA}\frac{\tan \varepsilon}{\tan \varepsilon_0},
:where {\varepsilon_0} is the angle subtended by the object at the front focal point of the objective and {\varepsilon} is the angle subtended by the image at the rear focal point of the eyepiece.
:*Example: The angular size of the full moon is 0.5°, in binoculars with 10x magnification it appears to subtend an angle of 5°, which is roughly 1/10th of the field of view of typical eyepieces.
:By convention, for magnifying glasses and optical microscopes, where the size of the object is a read more at » http://en.wikipedia.org/wiki/Magnification
Connect with people who share your interest by joining one of our Groups:
How to Draw My Own Building Plans
How to Send Pictures From Email to a Cell Phone
Kegel Exercise for Pregnant Women
How to Get Fired Gracefully
How to Stop a Shopaholic
How to Drive Defensively During the Holidays
Info on Caribbean Vacations
Copyright © 1999-2009 eHow, Inc. Use of this web site constitutes acceptance of the eHow Terms of Use and Privacy Policy. en-US Portions of this page are modifications based on work created and shared by Google and used according to terms described in the Creative Commons 3.0 Attribution License.
