petrographic microscope parts and functions pdf
Use a low power objective 3X or 4X. Brings the specimen into general focus.
Various parts of a microscope on the diagram.
. The thin sectioMechanical StageThe mechanical stage is an accessory which can be attached to the top of the r. After you have completed labeling the diagram complete the matching exercise. Moves the body tube for focusing the high power.
Below is a brief explanation of the more important parts of the microscope. Always carry a microscope with one hand holding the arm and one hand under the base. Move it until it is close to the objective.
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Microscope moves the stage up and down to bring the specimen into focus. Enabling the movement of the tube. The petrographic microscope is much like any other microscope with the exception of a few additional attachments that are necessary for optical mineralogy determination.
Connects the eyepiece to the objective lenses. A petrographic microscope is a type of optical microscope that uses polarized light to identify rocks and minerals in thin section and to investigate microscopic textures and features that are present in minerals and rocks. Practice moving the microscope stage up and down.
This module provides an overview of the parts of a petrographic microscope including the purpose of each. Adjust the eyepiece so that the cross-hairs are visible. In the Word Bank check the box next to each part of the microscope after you have labeled it on the diagram.
The gearing mechanism of the adjustment produces a large vertical movement of the stage with only a partial revolution of the knob. The simplest optical microscope is the magnifying glass and is good to about ten times 10X magnification. Insert interactive diagrams by Christie Liu and Mark Peale here.
Because of this the coarse adjustment should only be used with low power 4X and 10X objectives and never with the high power lenses 40X and. The substage assembly includes the condenser the lower polarizer light filters and diaphragms. In this lecture JP S.
Figure 422 Side view of microscope. You can use the word bank below to fill in the blanks or cut and paste the words at the bottom. Supports the tube and connects it to the base.
Anisotropic materials act as beam splitters and divide light rays into two parts. Parts of a eyepiece arm stageclips nosepiece focusing knobs illuminator stage objective lenses head base Label the parts of the microscope. Figure 423 Top view of microscope.
N is a function of crystallographic orientation in anisotropic minerals Öisotropic minerals. The viewer spins the nosepiece to select different objective lenses. The petrographic microscope is much like any other microscope with the exception of a few additional attachments that are necessary for optical mineralogy determination.
The technique of polarizing microscopy exploits the interference of the split light rays as they. Petrographic Microscope is very important tool to examine the optical properties of Earth Materials in thin section. A rotating turret that houses the objective lenses.
Up to 24 cash back Parts and Function of the Compound Light Microscope Objective lenses Focuses and magnifies light coming through the slide. The parts of the microscope that are located above the base but below the stage are called the substage assembly. Use the diagram as a guide to help you match the parts of the microscope with their function.
872018 2 Simple Compound Stereoscopic. Used for focus on oil. Microscope Parts and Functions Microscope One or more lenses that makes an enlarged image of an object.
Look at the diagrams of the petrographic microscope and its parts in Figures 421-424. One of the most important parts of a compound microscope. Fine tunes the focus and increases the detail of the specimen.
The compound microscope uses lenses and light to enlarge the image and is also called an optical or light microscope vs an electron microscope. Revolving nosepiece Rotates to allow use of different power objectives. The Functions Parts of a Microscope.
Interactive video showing typical adjustments that can be made on the substage assembly. N is a function of crystallographic orientation in anisotropic minerals Öisotropic minerals. Figure 1 contains a diagram of a petrographic microscope similar to the type that we have in the lab.
The lens at the top that you look through usually 10x or 15x power. Eyepiece ocular lens. Use a 10X eyepiece.
The bottom of the microscope used for support. The petrographic microscope Also called a polarizing microscope In order to use the scope we need to understand a little about. A petrographic microscope is a type of optical microscope used in petrology and optical mineralogy to identify rocks and minerals in thin sectionsThe microscope is used in optical mineralogy and petrography a branch of petrology which focuses on detailed descriptions of rocksThe method is called polarized light microscopy PLMDescription.
Figure 1 contains a diagram of a petrographic microscope similar to the type that we have in the lab. Characterized by one RI. Below is a brief explanation of the more important parts of the microscope.
Also called a polarizing. Figure 424 View of substage. Adjust the illumination so that it is even and covers the whole field of view.
Rotating Stage Goniometer and Vernier ScaleThe stage is the platform upon which the thin section is placed. Figure 421 Front view of microscope.
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