Objectivelens microscope function

I’m 87yrs old & need a Magnifying Glass on a stand so I can do some sewing underneath the glass, therefore needing my hands free! I think I need 2×3 strength? Await your reply! Thank-you. Hazel Vane

Objectivelens magnification

Total magnification: In a compound microscope the total magnification is the product of the objective and ocular lenses (see figure below).  The magnification of the ocular lenses on your scope is 10X.

Honing in on your personal needs will let you eliminate certain categories of magnifying glasses from your search right away.

Ocularlens magnification

One way to change the refractive index is by staining the specimen.  Another is to use immersion oil.  While we want light to refract differently between the specimen and the medium, we do not want to lose any light rays, as this would decrease the resolution of the image.  By placing immersion oil between the glass slide and the oil immersion lens (100X), the light rays at the highest magnification can be retained.  Immersion oil has the same refractive index as glass so the oil becomes part of the optics of the microscope.  Without the oil the light rays are refracted as they enter the air between the slide and the lens and the objective lens would have to be increased in diameter in order to capture them.  Using oil has the same effect as increasing the objective diameter therefore improving the resolving power of the lens.

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Resolving power or resolution: the ability to distinguish objects that are close together.  The better the resolving power of the microscope, the closer together two objects can be and still be seen as separate.

My 94yr old mother has requested a magnifying glass so she can see fine print when reading and do her daily crosswords. She’s an avid reader but even with her script glasses on finds the print hard to see. She currently also only has use of one arm

Ocular objectiveexample

A number of components contribute to the performance of your magnifying glass, but for the average user, there are three main features you should consider:

Ocular objectivevs magnification

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First and foremost, you should decide what purpose your magnifying glass is going to serve. It’s far better to let the project determine the magnifier required, than to try and turn a single magnifying glass into a one-size-fits-all tool:

It may sound strange, but the magnifier with the highest power isn’t always the best choice. The human eye has an optimal viewing distance: the closer we hold an object to our eyes, the more of its detail we can theoretically see, but it will be out of focus. That’s where the magnifying glass comes in. A magnifier with a 2X power, for example, enlarges an object and lets us see it as though it were two times closer to our eyes, but the object remains in focus. Does that mean that a magnifier offering 20X power is ten times more useful than our 2X magnifier? Not necessarily. There are limits to the practicality of a high-powered magnifying glass, because of the way that magnification, focal length and field of view work together.

Ocular objectivemicroscope

Although the perfect lightweight magnifier, combining a clear, high magnification with a wide viewing area is an optical impossibility, finding the perfect magnifying glass for your personal needs is not only possible, it’s a definite reality.

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High powerobjectivelens

Objectivelens

The field of view refers to the size of the area that’s in focus when viewed through a magnifier’s lens. In much the same way that focal length is inversely related to magnification, so too is the field of view. The higher the power of a magnifying glass, the smaller its field of view will be. That means you’ll be able to see more detail with a higher magnification, but only across a relatively small area. Generally speaking, a 2-3X magnifier offering a larger field of view is better for scanning activities like reading, while the smaller field associated with a higher magnification would be more appropriate for the inspection of fine detail.

The focal length of a magnifier is the distance from its lens to the object being viewed, when the object is in focus. The power and focal length of a magnifying glass are actually inversely related. In other words, the higher the magnification, the shorter a magnifier’s working distance is, and vice versa. Having sufficient room to manoeuver beneath the lens is an important consideration when your hobby or project requires the use of tools, and it’s one of the reasons why a higher magnification isn’t always the better choice.

Once you’ve determined the style and technical features that best suit your needs, you may also want to consider some of these important magnifying glass properties:

We take immense pride in our products and know you're going to love them as much as we do. If you're not 10/10 obsessed, let us know within 30 days for our 100% money back guarantee.

On all orders $90USD+ we offer free 2-7 business day standard shipping in the US + CA and 11-20 business day shipping in the UK. Unfortunately we are unable to make deliveries to PO boxes, APO/FPO, or US military bases outside the US.

With a wide range of styles and features to choose from, finding the right magnifying glass for your needs may seem a rather daunting task. But instead of exploring every option on the market, think of finding the right magnifier as shopping for your next pair of shoes: you want comfort and the best style, but above all you want the right fit.

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Immersion Oil:  Clear, finely detailed images are achieved by contrasting the specimen with their medium.  Changing the refractive index of the specimens from their medium attains this contrast.  The refractive index is a measure of the relative velocity at which light passes through a material.  When light rays pass through the two materials (specimen and medium) that have different refractive indices, the rays change direction from a straight path by bending (refracting) at the boundary between the specimen and the medium.  Thus, this increases the image’s contrast between the specimen and the medium.

Parfocal: the objective lenses are mounted on the microscope so that they can be interchanged without having to appreciably vary the focus.