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Scanning Electron Microscope

The scanning electron microscope scans the surface of the specimen with a beam of electrons.The electrons reflected off the surface are focused onto a screen or photographic plate into a three-dimensional image.
The resolution of the scanning electron microscope (SEM) is 3 - 10nm.

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Specification: OCR Biology A (H020), AS-level, 2.1.1 Cell structure. Topic: Components of Living Systems.

Key terms in this lesson

resolution
The ability to distinguish two objects that are close together as separate entities, which determines how much detail can be seen.

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All 21 lessons in Components of Living Systems · All OCR AS-level Biology topics