Compound Microscope

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A compound microscope is an optical instrument used to see objects that are too small for the naked eye. A compound microscope is a microscope fitted with two or more convex lenses. The high magnification produced by these lenses together enables a detailed study of micro-organisms, cells and tissues. These types of microscopes are therefore widely used in scientific and medical research. The basic design of a compound light microscope consists of convex lenses fitted at either end of a hollow tube.

This tube is fitted on an adjustable, rotary nosepiece.

There is an adjustable stage under the nosepiece; specimen slides are placed or fitted on this stage for observation through the lenses. The stage has a window or hole in it through which a light source can illuminate the specimen under observation (see Figure 1). . The light from the light source passes through the specimen, resulting in an image that your naked eye would ordinarily see if looking at the slide.

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The image is then magnified by the lower (objective) lens. The objective lens flips the image and magnifies it by bending the light.

The light is bent as it passes through the convex surface on either side of the lens material. The eyepiece acts as a weaker version of the objective lens by flipping the image again and magnifying it further. Compound microscopes are used most commonly to magnify thin sections of specimens placed on slides. The 400x compound microscope is used by almost every college level biology student. Almost every scientific field has found use, at some point, for magnifying small objects.

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Microscopes are probably used most often in biological and chemistry related fields.

They are routinely used in hospitals for diagnosis and research, and are common at police analysis labs. Compound microscopes have assisted in the discovery of the cell, the understanding of cell division, the study of bacteria and the study of molecules. A compound microscope consists of structural components, a base, body and arm, which house and support the optical components, and the optical components themselves, an eyepiece lens and an objective lens. The compound microscope is an optical instrument for forming magnified images of small objects, consisting of an eyepiece.

The eyepiece is the part where you will look through so that you can see the magnified image. It has a lens with a power of magnification of about 10X. This is one of the most recognizable parts of a compound microscope. An eyepiece consists of several “lens elements” in a housing, with a “barrel” on one end. The barrel is shaped to fit in a special opening of the instrument to which it is attached. The image can be focused by moving the eyepiece nearer and further from the objective.

Most instruments have a focusing mechanism to allow movement of the shaft in which the eyepiece is mounted, without needing to manipulate the eyepiece directly. Eyepieces for microscopes have standard barrel diameters measured in millimeters: 23. 2 mm and 30 mm. The eyepiece is connected to the tube. The mechanical tube length of an optical microscope is defined as the distance from the nosepiece opening, where the objective is mounted, to the top edge of the observation tubes where the eyepieces (oculars) are inserted.

Tube length has now been standardized to the Royal Microscopical Society (RMS) suggestion of 160 millimeters for finite-corrected transmitted compound microscopes. The tube part connects the Eyepiece to the Objective glass lenses. Objective Lenses in most microscopes, you will be able to identify about three to four objective lenses attached at the end of the Tube; the most common rate of these lenses range from 4X to 100X magnifying powers. As a standard, the longest objective lens provides greater magnifying power while the shortest provides the minimum.

Microscope objectives are characterized by two parameters: magnification and numerical aperture. The former typically ranges from 4? to 100?, while the latter ranges from 0. 10 to 1. 25, corresponding to focal lengths of about 40 to 2 mm, respectively. These lenses supported by the turret. Turret is the “dish” that provides support for all the Objective lenses. This dish can be rotated to allow the user to change power magnifications. The rotatable metal piece into which the microscope’s objective lenses are attached.

A “turret” style stereo microscope refers to the type that has more than one objective lens which can then be rotated into position. On a compound microscope the turret is the ring holding the objective lenses allowing the operator to rotate them into position as needed. DATE:August 14, 2012 TO:Prof. Cuevas, Technical English Instructor FROM:Group 6 SUBJECT:GHW2: MECHANISM DESCRIPTION (DRAFT) Here is our group homework number 2 (mechanism description draft) with correspondent requirements such as the totality of our machine subject in an expanded definition form, parts and description of compound microscope.

While doing our group homework number 2 (draft) we conclude all the necessary information on our topic and we used several expanding techniques, we elaborate all the parts and its function, we included how the compound microscope works our topic which is the compound microscope became more detailed and accurate. We assume any further updates and advised from you sir to make our GHW2 more precise and accurate so that we may attain our goal in making this mechanism description. Attachment: Mechanism Description (DRAFT)


Figure 1: A compound microscope


Figure 4: An eyepiece


Figure 3: A mechanical tube


Figure 4: A object lenses


Figure 5: A turret

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Compound Microscope. (2020, Jun 01). Retrieved from

Compound Microscope

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