THE MICROSCOPE Chapter 7. Introduction A microscope is an optical instrument that uses a lens or a combination of lenses to magnify and resolve the fine.

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Presentation transcript:

THE MICROSCOPE Chapter 7

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 magnified image seen by looking through a lens is known as a virtual image, whereas an image viewed directly is known as a real image.

Introduction Various types of microscopes are used to analyze forensic specimens.

The Compound Microscope In the basic compound microscope, the object to be magnified is placed under the lower lens (objective lens) and the magnified image is viewed through the upper lens (eyepiece lens). 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.

The Compound Microscope The microscope is composed of a mechanical system which supports the microscope, and an optical system which illuminates the object under investigation and passes light through a series of lens to form an image of the specimen.

The Comparison Microscope The comparison microscope consists of two 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.

The Comparison Microscope Modern firearms examination began with the introduction of the comparison microscope, with its ability to give the firearms examiner a side-by-side magnified view of bullets.

The Stereoscopic Microscope The stereoscopic microscope is actually two monocular compound microscopes properly spaced and aligned to present a three- dimensional image of a specimen to the viewer, who looks through both eyepiece lenses.

The Stereoscopic Microscope It is particularly useful for evidence not requiring very high magnification (10x-125x). Its large working distance makes it quite applicable for the microscopic examination of big, bulky items.

The Scanning Electron Microscope Finally, the scanning electron microscope (SEM) bombards a specimen with a beam of electrons instead of light to produce a highly magnified image from 100x to 100,000x.

The Scanning Electron Microscope Its depth of focus is some 300 times better than optical systems at similar magnification. The bombardment of the specimen’s surface with electrons normally produces X-ray emissions that can be used to characterize elements present in the material under investigation.