Microscope Definition and 252 Threads

Hi! I have a physics presentation tomorrow where I have to explain how a scanning tunneling microscope works. I also have to explain what quantum tunneling is and how it is used in a scanning tunneling microscope. I've done some research on the internet and I think I have a basic grasp of...

How will changing the aperture of the condenser of a microscope and the power of the light source change the image when it comes to contrast, depth of field and amount of light that reaches the camera?

Homework Statement The barrel of a compound microscope is 14.8 cm in length. The specimen will be mounted 1.03 cm from the objective, and the eyepiece has a 4.92 cm focal length. Determine the focal length of the objective lens Homework Equations (1/Do)+(1/Di)= (1/f) The Attempt...

I am trying to get a close look at magnetic nanoparticles under a relatively strong microscope (600 times plus). I am trying to observe their behaviour when an alternating magnetic field is applied. The problem is the alternating magnetic field heats up all metal in its surroundings...

I want to buy a microscope, and I want a really good one, and I want to do both dark field and phase contrast. I am looking at the Meiji MT 5000. I was wondering, what must be done to change from phase contrast to darkfield mode? Do I just need to change the objectives...

Homework Statement Monochromatic light of wavelength 500nm shines on a pair of identical glass microscope slides that form a very narrow wedge, as shown in the diagram. The top surface of the upper slide and the bottom surface of the lower slide have special coatings on them so that they do...

Whats the scale reading error for a traveling microscope Hi At school we done an experiment to determine the refractive index of a liquid using real and apparent depth. We used a traveling microscope a glass beaker and a coin. One question we got was what was the scale reading error...

Homework Statement Hey, I'm having trouble with this question on microscopes. A microscope is made up of an objective of power +100D and an eyepiece of power +50D, the two lenses being separated by 18cm. How far in front of the objective must an object be placed if the image of the object...

that could be used with our naked eye and we could see photons, would they colllapse to a particle?

Homework Statement A microscope has a converging lens (eyepiece) with focal length of 2.50 cm mounted on one end of a tube of adjustable length. At the other end is another converging lens (objective) with a focal length of 1.00 cm. When you place the sample 1.30 cm from the objective, what...

I need guidance on these questions, on microscopes Homework Statement In what direction will you move a centrally positioned specimen on a slide in order to view the top right hand corner of the specimen 2. The attempt at a solution is it to right then up ? someone please confirm this...

One way in which Heisenberg originally argued for the uncertainty principle is by using an imaginary microscope as a measuring device [2] he imagines an experimenter trying to measure the position and momentum of an electron by shooting a photon at it. If the photon has a short wavelength, and...

hi every1 what do you see if you look at ice through a standard microscope? is the structure too small to be seen? thanks charlie

Simple Microscope Problem that I have been STUCK on! Homework Statement How far from a lens of focal length 50 mm must the object be placed if it is to form a virtual image magnified in size by a factor of 3? Homework Equations The Attempt at a Solution I thought I could us the...

I was wondering if someone would recommend me a good microscope? I am majoring in Molecular Biology, and would like a decent optical microscope for viewing cells and bacteria. What is a good and reliable model that is not too expensive? I see a lot of microscopes on ebay for around $250-$350...

Homework Statement The image formed by a microscope objective with a focal length of 5.00\;{\rm mm} is 160\;{\rm mm} from its second focal point. The eyepiece has a focal length of 26.0\;{\rm mm}. What is the angular magnification of the microscope? Homework Equations The...

I noticed that websites usually say that the maximum effective magnification of a light microscope is 2000x, so electron microscopes are used for greater resolution due to their shorter wavelength, but don't photons in the gamma ray range have an even shorter wavelength, allowing them to see...

Homework Statement Using a microscope, smoke particles can be seen moving inside a glass tube. They appear as tiny spots of light that move in various directions. The air molecules inside the glass tube cannot be seen with the aid of the microscope. a) State why a microscope is needed to...

''The Scanning Tunnelling Microscope probes the density of states of a material''... What does this actually mean?

A microscope is made in a tube 25.0 cm long. It magnifies 5.00 x 102 times, 50.0 times by the objective lens and 10.0 times by the eyepiece. What are the focal lengths of the two lenses?

Hello, I thought I help my nice with her microscope. We want to know how large some plant cells are that we're looking at. Hoe do we do that? There is no scale inside the microscope so I wonder if it possible to work out how large the field of view is with a certain lense. What do we have...

A compound microscope has the objective and eyepiece mounted in a tube that is 18.0 cm long. The focal length of the eyepiece is 2.08 cm, and the near-point distance of the person using the microscope is 25.0 cm. If the person can view the image produced by the microscope with a completely...

Does anyone know how to look at a object from the side way on a microsocope? I've tried using a mirror, but the focus distance (to the object in the mirror) was too small. I've also tried to google "90 degree microscope objective lens" or something like that, but couldn't find anything...

I am working on a project involving a scanning tunneling microscope, and to move atoms i need an untra high vacuum chamber. Any info you have on UHV or STM would be immensly appreciated.:rolleyes: Thanks

I am really keen to buy a microscope (just a hobbyist) and have been googling to find what to look/watchout for etc, but there seems to be a severe lack of info/reviews about particular scopes which makes it hard to know what scope to get. I was thinking there would be a wealth of info on the...

I am a freshman high school student working on a scanning tunneling microscope for a science fair project. I need to build a vacuum for bottom up capabilities. If anyone can help with the STM or the vacuum it would be greatly appreciated.:rolleyes:

Homework Statement A microscope has an objective lens with a focal length of 16.22 mm and an eyepiece with a focal length of 9.30 mm. With the length of the barrel set at 25.0 cm, the diameter of a red blood cell's image subtends an angle of 1.43 mrad with the eye. If the final image distance...

Homework Statement The highest achievable resolving power of a microscope is limited only by the wavelength used; that is, the smallest item that can be distinguished has dimensions about equal to the wavelength. Suppose one wishes to "see" inside an atom. Assuming the atom to have a diameter...

Hi every body! does anyone seen live specimen under the microscope? How does live specimen moves and interacts? What kind of scope do i need to have darkfield and brightfield application? Is there any scope that can be used in two applications?:confused: Would anyone help me choose what kind...

How is this microscope going to be way way better than the electron microscope? Does anyone know the significance of this piece of equipment? Website links would also be nice... thanks

Is transmission electron microscope the original EM, and Scanning the better resolution one. What is the main difference between the two

how can i measure resolution of SEM? please help! :cry:

What is the most powerful microscope in the world? And when I say microscope, I mean a microscope that can produce an actual image, nothing like the atom tip microscope or whatever. What is the smallest object anyone has ever seen? In other words, I want to see a REAL image of whatever is the...

What is our best microscope for resolving and magnifying objects (best combined)? eg.s PET SEM AFM etc. Here is an image I posted of a tiny nano object, I forget what was used to create it, but its impressively small. The image can almost see a single atom I think, since atomic...

electrons in an electron microscope are accelerated form rest to a momentum making their wavelength 0.06 nm. 1. what is the voltage Vo needed for this? 2. What is the final electron velocity? For 1. E=\frac{hc}{\lambda}=\frac{1240eVnm}{0.06 nm} solve for E For 2. E=.5mv^2...

Hi, for my integration class I am building a scanning tunnelling microscope (STM). I found some interesting designs and I choose the cheapest one (students are poor) witch uses a unimorph disk. Here is the STM design I plan to build: http://www.geocities.com/spm_stm/". For my class I need to...

Hi, for my integration class I am building a scanning tunnelling microscope (STM). I found some interesting designs and I choose the cheapest one (students are poor) witch uses a unimorph disk. The circuits are not that hard to build but I also need to understand them. I have some knowledge in...

I know this guy, and he say the Hubble telescope is worthless and has never done anything because it cannot take clear pictures of the Apollo landing site. This because he think it was a hoax and he wants proof:rolleyes: . He is currently not convinced of the reason Hubble cannot take such...

how do you calculate the following question? what is the smallest distance that could possibly resolve for an electron microscope operating at 50KV?

Does anybody know if the nuclear force microscope exists, where one could remove or put 1 nucleon at a time into an exisiting nucleus ? (using the same principle as AFM should be too gross...since the tip can not, at my knowledge..be made of one nucleon...maybe an electromagnetic coupling that...

Hey. So like my topic says, I am thinking about buying a microscope via eBay for home use. It's generally to run my biology experiments. I am looking at a microscope with around 1600x magnification so it's possible for me to be able to go further in my experiments. I have been looking...

i have some questions regrading to "how to updrage my microscope?" i'll be very thankfull for any kind of reply... I am a student that need to make a little project, so i don't have much knowledge... I have a pretty old microscope - "ergolux zl-19". and i want to upgrade it, so it will have...

Can someone tell me what sort of equation I would use for this question, I can't use the magnification as I have two unknowns. At least I don't know how to apply the magnification equation to this question. A microscope is made in a tube 25.0cm long. It magnifies 5.00 x 10 to the 2 times...

what is a disadvantage of using diffential staining (dyes to increase the speciman's contrast) in light microscopes?

Hi, I'm having trouble with a problem that I'm doing in my electricity and magnetism class. I can't even understand what it's asking and what the picture looks like. Here is the problem: In an electron microscope, a beam of energetic electrons, originally accelerated through a potential of...

I have preety good microscope at home and I'm wondering if it is possible to see sperm and individual guys under magnification? :blushing: How do i go about it?(first step, masturbate and then?) Thanks for any help.

I am curious about microscopes, I know i could buy an optical one for around $200 $500, i am wondering about how hard it would be to build a microscope that sees at the atomic level? I imagine buing one is pricey. Is it within the budget and access of Average Joe to build a microscope that powerful?

Don't know where to post this, I hope is in the right place. What's the maximum number of magnifications that a microscope (of any class) has achieved to date? I want concrete ciphers.

A Virtual Scanning Electron Microscope, the link is provided to me (and anyone who reads that Journal) by the People at the Journal Science, The AAAS... Click http://www.vcbio.sci.kun.nl/eng/fesem/"

could be used in a lab. I would like to do my own research on reproduction and I was curious what magnification level microscope would I need to look at spermatzoa? Do I need a scope more then 1000x? I have tried google and I can't find anything anywhere. Would this microscope work...