Physics 25: 7-12 Resolution and Microscope
Text Reading: Giancoli, Physics - Principles with Applications, Chapter 25: Sections 7 to 12
- Section 7: Resolution is the ability of a lens to show close objects as two distinct points. The maximum resolution is depends on the diameter of the lens and the wavelength of light and is given by the Rayleigh criterion.
- Section 8: The resolving power also depends on the focal length.
- Section 9: There are practical limits to human eye and microscope magnifications because of the wavelength and diameter dependencies of resolution. Light microscopes above 1000X suffer from too much chromatic aberration to be useful.
- Section 10: The resolving power of a lens can be increased by using computers to interpret information from the source through the lens to reduce aberration.
- Section 11: X-ray diffraction can be used to analyze rays scattered by the surfaces of very small objects, such as protein molecules.
- Section 12: Modern X-ray techniques such as CT (computed tomography) and CAT (computer-assisted tomography) allow non-destructive exploration of human tissues, and are important tools for diagnosis and treatment of disease and injury.
||Minimum angular separation|
||Minimum linear separation|
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