The Microscope
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- Category: Science
- Date Submitted: 04/03/2014 05:08 PM
- Pages: 3
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The Microscope
Introduction
* A microscope is an optical instrument that uses a lens or a combination of lenses to magnify and resolve the fine details of an object.
* The earliest methods for examining physical evidence relied solely on the microscope.
* The magnified image seen by looking through a lens is known as a ______________, whereas an image viewed directly is known as a __________________.
* The object to be magnified is placed under the lower lens, called the objective and viewed through the upper lens, called the eyepiece.
* Example- compound microscope
The Compound Microscope
* The magnification of the image can be calculated by multiplying the magnifying power of the objective lens times the magnifying power of the eyepiece lens.
* Calculate the total Magnification:
If using a 4x objective the total magnification would be:
4 (objective) times 10 (ocular) =
If using a 100x objective:
100 (objective) times 10 (ocular) =
* Know this vocabulary! (see fig 7-3 for help)
* Base
* Arm
* Stage
* Body Tube
* Coarse Adjustment
* Fine Adjustment
* Illuminator
* Condenser
* Objective Lens
* Revolving nosepiece
* Parafocal: when the microscope is focused with one objective in place, another objective can be rotated into place and the specimen remains very nearly in correct focus.
* Eyepiece or Ocular Lens
* Monocular: a microscope having only one eyepiece
* Binocular:
The Comparison Microscope
* 2 independent objective lenses joined together by an optical bridge to a common eyepiece lens
* When a viewer looks through the eyepiece lens of the comparison microscope, the objects under investigation are observed side-by-side in a circular field that is equally divided into two parts.
* Modern firearms examination began with the introduction of the comparison microscope, with its ability to give...
Introduction
* A microscope is an optical instrument that uses a lens or a combination of lenses to magnify and resolve the fine details of an object.
* The earliest methods for examining physical evidence relied solely on the microscope.
* The magnified image seen by looking through a lens is known as a ______________, whereas an image viewed directly is known as a __________________.
* The object to be magnified is placed under the lower lens, called the objective and viewed through the upper lens, called the eyepiece.
* Example- compound microscope
The Compound Microscope
* The magnification of the image can be calculated by multiplying the magnifying power of the objective lens times the magnifying power of the eyepiece lens.
* Calculate the total Magnification:
If using a 4x objective the total magnification would be:
4 (objective) times 10 (ocular) =
If using a 100x objective:
100 (objective) times 10 (ocular) =
* Know this vocabulary! (see fig 7-3 for help)
* Base
* Arm
* Stage
* Body Tube
* Coarse Adjustment
* Fine Adjustment
* Illuminator
* Condenser
* Objective Lens
* Revolving nosepiece
* Parafocal: when the microscope is focused with one objective in place, another objective can be rotated into place and the specimen remains very nearly in correct focus.
* Eyepiece or Ocular Lens
* Monocular: a microscope having only one eyepiece
* Binocular:
The Comparison Microscope
* 2 independent objective lenses joined together by an optical bridge to a common eyepiece lens
* When a viewer looks through the eyepiece lens of the comparison microscope, the objects under investigation are observed side-by-side in a circular field that is equally divided into two parts.
* Modern firearms examination began with the introduction of the comparison microscope, with its ability to give...