Magnifiers & Hand Lenses - scientific magnifying glass
It wouldn’t feel like the start of a new year if we weren’t hearing from readers about their love-hate relationship with resolutions. On one hand, the calendar hands you a clean slate. It arrives after weeks of festivities during which overindulgence has been a guiding principle. We’ve eaten and drunk our fill, and we now find ourselves not only ready, but even eager, for a reset. On the other hand, we’re still the same people we were before Thanksgiving signaled the start of the annual bingeing season. All of the reasons we didn’t lose those 10 pounds last August, or didn’t quit our sugar habit in March, still hold true.
It is important to always use the correct immersion media (e.g. air, water, oil, etc.) that is specified by your objective lens.
Numerical aperture of 100x objective lensformula
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Numerical aperture of40xobjective lens
The high-powered objective lens (also called “high dry” lens) is ideal for observing fine details within a specimen sample. The total magnification of a high-power objective lens combined with a 10x eyepiece is equal to 400x magnification, giving you a very detailed picture of the specimen in your slide.
Numerical aperture of10xobjective lens
In terms of your resolution to eat less processed snack food and to cut down on sugar, you might try flipping the focus. Instead of thinking in terms of what you’re going to eliminate from your diet, try making a specific decision about something that you will add. For instance, you might start with the resolution to eat one piece of fresh fruit at each meal. You can up the ante by agreeing that, before indulging in any kind of snack food, you first have to eat something good for you, like a fresh carrot. That way, even if you do waver in your resolve and slip into old habits with a bar of chocolate or a bag of chips, you’ve also kept your resolution. Change is hard, and even small victories can make it easier to stay on track.
Numerical aperture ofcondenserlens
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A scanning objective lens provides the lowest magnification power of all objective lenses. 4x is a common magnification for scanning objectives and, when combined with the magnification power of a 10x eyepiece lens, a 4x scanning objective lens gives a total magnification of 40x. The name “scanning” objective lens comes from the fact that they provide observers with about enough magnification for a good overview of the slide, essentially a “scan” of the slide. Some objectives with even lower power are discussed in Specialty Objectives below.
If you are interested in buying various types of objective lenses for your microscope in the classroom, laboratory, research facility, or any other purpose, ACCU-SCOPE can provide the products you are looking for. Contact us today to learn more about our objective lenses and other microscope accessories.
Numerical aperture ofmicroscope formula
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Research into the topic of New Year’s resolutions finds that many of us fall off the wagon surprisingly soon. An analysis of the online activity of more than 31 million people suggests that by the end of January, many resolutions are already in the rearview mirror. More rigorous studies from the University of Scranton tracked the slow decline of resolve. By the end of one week, researchers found that 23% of the study participants had already abandoned their resolutions. After three months, half had called it quits. When the researchers followed up two years later, about 20% of participants said they had been successful at keeping their resolutions.
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Numerical aperture ofoil immersionlens
Numerical aperture of4xObjective lens
The low power objective lens has more magnification power than the scanning objective lens, and it is one of the most helpful lenses when it comes to observing and analyzing glass slide samples. The total magnification of a low power objective lens combined with a 10x eyepiece lens is 100x magnification, giving you a closer view of the slide than a scanning objective lens without getting too close for general viewing purposes.
Most compound microscopes come with interchangeable lenses known as objective lenses. Objective lenses come in various magnification powers, with the most common being 4x, 10x, 40x, and 100x, also known as scanning, low power, high power, and (typically) oil immersion objectives, respectively. Let’s take a closer look at each of the different magnifications of objective lenses and when you would use them.
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Numerical aperture of objective lens
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The oil immersion objective lens provides the most powerful magnification, with a whopping magnification total of 1000x when combined with a 10x eyepiece. But the refractive index of air and your glass slide are slightly different, so a special immersion oil must be used to help bridge the gap. Without adding a drop of immersion oil, the oil immersion objective lens will not function correctly, the specimen will appear blurry, and you will not achieve an ideal magnification or resolution. Oil immersion lenses are also available from some manufacturers in lower magnifications, and provide higher resolution than their "high dry" counterparts.
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There are several other objective lens magnifications available with utility for particular applications. The 2x objective, widely used in pathology, has only ½ the magnification of a 4x scanning lens, thus providing a better overview of the sample on the slide. The 50x oil immersion objective, often used in place of the 40x objective, is used as a gold standard for observing blood smears. The 60x objective, often available in either dry or oil immersion, provides 50% greater magnification than a 40x lens. The 60x dry is sometimes chosen over a 100x oil immersion lens for higher magnification without the need to use immersion oil. Finally the 100x dry objective doesn’t need immersion oil to deliver high magnification (still 1000x when combined with 10x eyepieces). However, the numerical aperture (an indication of resolving power of an objective) of a 100x dry objective is much lower than that of a 100x oil immersion objective and, as a result, the ability of the lens to resolve fine details in the specimen is much lower, too.
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I saw on the news that there’s a new study about how to make a successful New Year’s resolution. My wife and I have the same list of resolutions every year, including to stop eating so much junk food and to quit sugar. And around this time every year, we give up on them. We would love to know why it’s hard to follow through.
In the study you’re asking about, published last December in the journal PLOS One, the researchers looked at what separated the people who managed to keep their resolutions from those who didn’t. They found that how someone states their goal can make a difference. People whose goals were of the “I will” variety had a higher rate of success than those who approached their resolutions with “I won’t.” Specifically, 59% of the 1,066 study participants with proactive goals considered themselves successful, while only 47% of those with avoidance-oriented goals felt they had succeeded.
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