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Updated Mar 24, 2026
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Exploring Electron Microscopy: A Comparison with Light Microscopes
Ffion
@ffion_lm
Types of Microscopes and Their Capabilities
Electron microscopes revolutionize our view of the microscopic world by using electron beams with wavelengths under 1nm. The Transmission Electron Microscope (TEM) focuses electrons through the specimen with electromagnets, creating detailed 2D images. Denser parts absorb more electrons, appearing darker in the image, and TEMs can achieve an impressive magnification of 500,000x with resolution of 0.0002μm.
The Scanning Electron Microscope (SEM) works differently, sending electrons across the specimen's surface and collecting reflected electrons. This creates detailed 3D images at magnifications up to 100,000x with 0.002μm resolution. Specimens for electron microscopy must be stained with heavy metals like gold, which scatter electrons to create contrast, with color added artificially afterward.
Light microscopes remain valuable tools despite lower magnification (up to 2,000x). They're inexpensive, portable, simple to operate, and can examine living specimens without requiring a vacuum. The Laser Scanning Confocal Microscope represents an advanced light microscope that uses laser beams to make fluorescent dyes in the specimen emit light, creating exceptionally clear images by blocking out-of-focus light through a pinhole.
Did you know? Electron microscopes must operate in a vacuum because air molecules would scatter the electron beam, making these instruments much larger and more complex than light microscopes.
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Basil
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This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
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I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
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This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
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Anna
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Best app on earth! no words because it’s too good
Thomas R
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David K
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Rohan U
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I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
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Elisha
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Exploring Electron Microscopy: A Comparison with Light Microscopes
Ffion
@ffion_lm
Microscopes open up a world of discovery by allowing us to see beyond what's visible to the naked eye. Different types of microscopes use varying technologies to visualize specimens, each with their own capabilities and limitations that make them suitable... Show more
Types of Microscopes and Their Capabilities
Electron microscopes revolutionize our view of the microscopic world by using electron beams with wavelengths under 1nm. The Transmission Electron Microscope (TEM) focuses electrons through the specimen with electromagnets, creating detailed 2D images. Denser parts absorb more electrons, appearing darker in the image, and TEMs can achieve an impressive magnification of 500,000x with resolution of 0.0002μm.
The Scanning Electron Microscope (SEM) works differently, sending electrons across the specimen's surface and collecting reflected electrons. This creates detailed 3D images at magnifications up to 100,000x with 0.002μm resolution. Specimens for electron microscopy must be stained with heavy metals like gold, which scatter electrons to create contrast, with color added artificially afterward.
Light microscopes remain valuable tools despite lower magnification (up to 2,000x). They're inexpensive, portable, simple to operate, and can examine living specimens without requiring a vacuum. The Laser Scanning Confocal Microscope represents an advanced light microscope that uses laser beams to make fluorescent dyes in the specimen emit light, creating exceptionally clear images by blocking out-of-focus light through a pinhole.
Did you know? Electron microscopes must operate in a vacuum because air molecules would scatter the electron beam, making these instruments much larger and more complex than light microscopes.
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What is the Knowunity AI companion?
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Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
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Students love us — and so will you.
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4.7/5
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
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Samantha Klich
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Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
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Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
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This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
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Xander S
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This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
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This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
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Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
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Android user
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Greenlight Bonnie
Android user
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Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
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Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user