Summary
Light microscopes magnify living cells up to about 1000 times, while electron microscopes reveal fine internal detail.
In depth
Light microscopes use glass lenses and typically resolve down to about 200 nm, enough to see cells and large organelles. Electron microscopes use electron beams with much shorter wavelength, resolving down to below 1 nm; TEM shows internal slices and SEM shows surface 3D detail.
Samples usually need staining for contrast, and electron microscopy requires dead, dehydrated samples in a vacuum.
Key idea: magnification makes an image larger, but resolution decides how much real detail you can see.
Magnification is how much larger the image is, while resolution is the smallest distance at which two points can be told apart; useless magnification beyond the resolution limit only makes a bigger blur. Light microscopes include bright-field, phase contrast and fluorescence modes; confocal microscopes build sharp optical sections, and super-resolution methods (STORM, STED) reach about 20 nm.
Cryo-electron microscopy flash-freezes samples to reveal molecular structures at near-atomic detail, and was recognised by the 2017 Chemistry Nobel Prize.
Calculation: actual size = image size divided by magnification, so a 5 mm image at x1000 shows an object of 5 micrometres.
Frequently asked questions
What is Microscopy Basics?
Light microscopes magnify living cells up to about 1000 times, while electron microscopes reveal fine internal detail.
Which area of biology covers Microscopy Basics, and how advanced is it?
Microscopy Basics is one of the 52 topics in Cell Biology. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Eukaryotic Cell, Cell Size and Surface Area, Prokaryotic Cell.
What should I learn before Microscopy Basics?
Microscopy Basics is a Beginner topic, so no earlier topic is required. Other Beginner topics in Cell Biology that pair well with it include Cell Theory, Prokaryotic Cell, Eukaryotic Cell.
What topics are related to Microscopy Basics?
The closest topics to Microscopy Basics are Eukaryotic Cell, Cell Size and Surface Area, Prokaryotic Cell, Simple Diffusion. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Microscopy Basics?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Microscopy Basics. To practise the whole of Cell Biology, use the Cell Biology quiz.
How is Microscopy Basics different from Eukaryotic Cell?
Microscopy Basics: Light microscopes magnify living cells up to about 1000 times, while electron microscopes reveal fine internal detail. Eukaryotic Cell: A complex cell with a true nucleus and membrane-bound organelles, found in animals, plants, fungi and protists. Read both side by side and note what each one explains.
How should I study Microscopy Basics step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Eukaryotic Cell and explain the difference aloud. Finally, take the Cell Biology quiz and come back to this page for any question you miss.