Microscopes are instruments which are used to view objects which are too small to view with the naked human eye. Microscopes are commonly used in microbiology, chemistry, physics and several other fields.
Two commonly used microscopes are light microscopes and electron microscopes. Although both of these microscopes help study microscopic structures, they vastly differ in magnification, resolution, specimen preparation, image formation and applications.
In this article we briefly discuss what is a light microscope and electron microscope and the difference between them.
Light microscopes are also called optical microscopes. Modern light microscopes use visible light or white light to illuminate the specimen so the specimen can be magnified and viewed through eyepiece. Light microscopes are most commonly employed in plant science, animal science, microbiology and visualize stained tissue samples.
The electron microscope uses a beam of electrons as a source of illumination to magnify objects' images, unlike a visible or white light used in a light microscope. The wavelength of an electron can be 100,000 times shorter than the visible light, so electron microscopes have a higher resolving power.
Common light microscopes have a magnification power between 40 to 20,000 times. Electron microscopes can have magnification power of more than 1 million times. There are two types of electron microscopes: Transmission EM (TEM) and Scanning EM (SEM).
In this article we briefly discuss what is a light microscope and electron microscope and the difference between them.
What is a Light Microscope?
Light microscopes are also called optical microscopes. Modern light microscopes use visible light or white light to illuminate the specimen so the specimen can be magnified and viewed through eyepiece. Light microscopes are most commonly employed in plant science, animal science, microbiology and visualize stained tissue samples.
What is an Electron Microscope?
The electron microscope uses a beam of electrons as a source of illumination to magnify objects' images, unlike a visible or white light used in a light microscope. The wavelength of an electron can be 100,000 times shorter than the visible light, so electron microscopes have a higher resolving power.
Common light microscopes have a magnification power between 40 to 20,000 times. Electron microscopes can have magnification power of more than 1 million times. There are two types of electron microscopes: Transmission EM (TEM) and Scanning EM (SEM).
Difference Between Light Microscope vs Electron Microscope
| Light Microscope | Electron Microscope |
| Meaning | |
| A microscope that uses visible light and optical lenses to magnify and observe small specimens. | A microscope that uses a beam of electrons and electromagnetic lenses to produce highly magnified images of very small structures. |
| Illumination Source | |
| Uses visible light with a wavelength of about 400–700 nm. | Uses electrons with wavelengths much shorter than visible light. |
| Magnification | |
| Typically provides useful magnification of about 40× to 1,500×. | Magnification from thousands to millions of times. |
| Resolution | |
| Conventional light microscopes can resolve details down to about 200 nm. | Can resolve structures in the nanometer range and TEMs, at atomic scale. |
| Lenses | |
| Uses glass or optical lenses. | Uses electromagnetic lenses. |
| Specimen | |
| Can be used to observe living and non-living specimens. | Electron microscopes generally require fixed and specially prepared |
| Specimen Preparation | |
| Usually requires simple and relatively quick preparation. | Usually requires more complex and time-consuming preparation. |
| Specimen Thickness | |
| Can examine relatively thick specimens, thin sections used for clear imaging. | TEM specimens must be extremely thin, often around 50–100 nm. |
| Vacuum Requirement | |
| Normally operates under atmospheric pressure. | The electron column normally operates under a high vacuum. |
| Image Formation | |
| Image is formed from light that is transmitted, absorbed, reflected, or scattered by the specimen. | Image is formed from electrons transmitted through or scattered by the specimen. |
| Image Viewing | |
| Image can be viewed through an eyepiece or camera. | Image is detected electronically and usually viewed on a computer monitor. |
| Image Color | |
| Can produce color images, especially when stains or dyes are used. | Images are normally grayscale; color may be added digitally. |
| Surface Details | |
| Provides limited detail of very small surface structures. | SEM provides highly detailed images of specimen surfaces. |
| Internal Structures | |
| Can show cells, tissues, and some internal structures. | TEM can reveal very fine internal and ultrastructural features. |
| Common Uses | |
| Widely used in education, biology, medicine, clinical laboratories, and routine research. | Widely used in advanced biological research, nanotechnology, materials science, and medical research. |
| Maintenance Cost | |
| Generally less expensive and easier to maintain. | Generally more expensive and requires specialized maintenance. |