Dichroicbeam splitter

Note: the article keyword search field and some other of the site's functionality would require Javascript, which however is turned off in your browser.

The imaging properties of a magnifying glass must always be considered in conjunction of those with the human eye. The magnification of a loupe is defined as the ratio of the parent object sizes as observed with and without the glasses. For reading a book with small letters, for example, one may hold a magnifying glass in a significant distance from the eye, closer to the read text. When calculating the magnification based on a comparison of observation with and without the magnifying glass, but each time from the same relatively large distance, one obtains the magnification to be 1 plus the ratio of image distance and focal length.

Here you can submit questions and comments. As far as they get accepted by the author, they will appear above this paragraph together with the author’s answer. The author will decide on acceptance based on certain criteria. Essentially, the issue must be of sufficiently broad interest.

Polarizingbeam splitterCube

A magnifying glass can also be used as burning glass, concentrating sunlight such that a material like paper in the focal plane can be incinerated.

Usually, the magnification of a simple magnifying glass is between 2 and 6. Higher magnifications would lead to a reduced image quality, as long as a simple lens is used. There are improved multi-lens designs, e.g. triplet magnifiers, which provide substantially higher magnification (up to about 30), but with a small field of view and less light throughput. They normally need to be held close to the eye, and should therefore be called loupes. Four higher magnifications, one uses microscopes.

Magnifying glasses are a simple optical devices used for viewing details of objects with some magnification. They are sometimes regarded as being the same as loupes, but precisely speaking a loupe is used in a close distance from the eye, while magnifying glasses (or hand lenses) are held at a larger distance. Magnifying glasses are typically used in a larger distance from the eye, are themselves larger and typically have a longer focal length of 125 mm or more.

Aplanatic glasses, consisting of two plano-convex lenses, with the convex surfaces on the inner side, are popular as reading glasses because they exhibit low image distortions.

Using our advertising package, you can display your logo, further below your product description, and these will been seen by many photonics professionals.

By submitting the information, you give your consent to the potential publication of your inputs on our website according to our rules. (If you later retract your consent, we will delete those inputs.) As your inputs are first reviewed by the author, they may be published with some delay.

beamsplitter中文

The same effect can create a safety hazard; it can happen that a fire inadvertently arises from a magnifying glass, e.g. when displayed in a shop window. It is advisable to appropriately cover magnifying glasses when they are not in use.

Polarizingbeam splitterprinciple

Such a device typically consists of a single lens, which modifies the path of light by refraction. The lens is usually mounted in a frame with a handle.

Beam splitter

Particularly large magnifying glasses may be made in the form of Fresnel lenses (e.g. as thin sheet magnifiers), but then with reduced image quality.

Magnifying glasses can simply be made as spherical biconvex glass lenses. For a not too large field of view, the solution may be satisfactory. Plastic optics are often used instead of glass, and then it is usually not a problem to make an aspheric lens.

PolarizationBeam splitterfiber

Note: this box searches only for keywords in the titles of articles, and for acronyms. For full-text searches on the whole website, use our search page.

Further, we have many interesting case studies on the same page, with topics mostly in fiber optics. Concrete examples cases, investigated quantatively, often give you much more insight!

Please do not enter personal data here. (See also our privacy declaration.) If you wish to receive personal feedback or consultancy from the author, please contact him, e.g. via e-mail.

The required illumination of the object may be done through the lens and/or from the side. Illumination through the lens can have the advantage that it is brighter, with some concentration of the light by the lens. On the other hand, one may then be disturbed by parasitic reflections, if the lens does not have effective anti-reflection coatings.