Lastly, the iris diaphragm controls the amount of light reaching the specimen. OBJECTIVES The objectives were to identify the parts and functions of a compound microscope, learn to adjust the microscope for viewing biological specimens, and to learn to measure small objects using the principles of microscopy. MATERIALS AND METHODS The experiment aimed to familiarize students from the parts and uses of a compound
Exploration of Light Microscopes What does the word microscope mean: The first part of the word "Micro" means tiny. The "scope" part means to look at or view. Microscopes are tools that are used too enlarge images of small objects so that they can be studied. A light microscope is an instrument made up of two lens they are eyepiece lens and the object lens combined they produce a much greater magnification that what is possible with just one single lens. The microscope also has a variety of knobs to focus the picture seen thought the microscope.
Scientific theory: In order to see through microscopes, light has to travel to your eye from its origin. There are initially four stages of how the light travels to your eye. Firstly the light that is generated by the light bulb in the microscope is reflected off of a mirror. This lightens the sample you are studying. The light that is reflected off of the mirror then passes up into the shaft of the objective lens (located at the bottom of the tube).
Features of various microscope. Bright feild microscope. Brightfeild microscopes have two lens system for magnification of specimen. The two lenses are ocular lens at
The stage has a small hole through... ... middle of paper ... ...Ms and powerful optical microscopes, SEMs produce detailed pictures of the surface of objects, providing a realistic three-dimensional image. Various other electron microscopes have been developed. A scanning transmission electron microscope (STEM) combines elements of an SEM and a TEM, and can resolve single atoms in a sample. An electron probe microanalyser, which is an electron microscope fitted with an X-ray spectrum analyser, can examine the high-energy X-rays that are emitted by the sample when it is bombarded with electrons. Because the identity of different atoms or molecules can be determined by examining their X-ray emissions, electron probe analysers not only provide a magnified image of the sample as a conventional electron microscope does, but also information about the sample's chemical composition.
Each one uses radiation. However, each has different imaging processes. (Degree Dictionary) Computed radiography, or CR, uses photostimulate phosphor plates to obtain digital images. This type of radiology stores the images on a plate with phosphors that are activated and retained when the image is taken. A laser then scans the plate, which is converted to digital format.
A description of each image produced will also be given (attitude, type, magnification and location). Apparatus: The main tools (apparatus) used in the experiment consist of a ray box containing cards which allow one, two, three or four rays onto a sheet of paper at a time so that rays path from the box to the mirror will be able to be traced. Also two (2) different types of converging lenses, one being cylindrical while the other being spherical, the difference being that the spherical one is used for viewing, the cylindrical one for use with the ray box. These lenses are one of many different sorts of lenses in the "lens box". The use of a ruler would also be helpful so that accurate measurements may be taken.
Electron Microscope An electron microscope has many uses today, mainly to do with scientific study. The electron microscope has been developed to look at the tiniest structures, arrangements and components; it can magnify an object two million times. It works by using electrons instead of light. The electrons can fit through smaller gaps in specimens creating a clearer magnified image. There are two types of electron microscope, a scanning electron microscope and a transmission electron microscope.
The optics unit had many different strands talking about light and how it works, which included many calculations, formulas, and the different wavelengths in which light or waves function. The strands that really helped me as a student understand the world of optics and the many rules, included the types of mirrors and lens such as converging mirrors and the set of equations that went with them, the optics technology carousel which helped me understand the outside world and how the medical field uses optics in their machines and daily life, and finally the biology of the eye and how light works with it to produce a clear and crisp image for the brain to analyze and process information. Overall, I believe that the Physics unit was a very fresh, new and important concept to learn.
Part A. Our eyes are an incredible and incredibly complex organ. We are able to look at and around our surrounding environments and dynamically adjust as needed. The camera can be used as an analogy to the eye and visual system, though it should be noted that there are limitations such as, cameras only capture a single still image (from that perspective, perhaps what we see is more akin to that of a video camera). The table below explains how individual components of the eye can be compared to individual components of the camera and their roles in each system.