Science 7: The Microscope PDF

THE MICROSCOPE SCIENCE 7 QUARTER 2 LESSON 1 Transforming Ourselves, Transforming Our World  MICROSCOPE A microscope is a scientific instrument that magnifies objects, allowing us to see details that are not visible to the naked eye. They are commonly used in biolo...

THE MICROSCOPE SCIENCE 7 QUARTER 2 LESSON 1 Transforming Ourselves, Transforming Our World  MICROSCOPE A microscope is a scientific instrument that magnifies objects, allowing us to see details that are not visible to the naked eye. They are commonly used in biology to study cells, microorganisms and other tiny structures. Microscopes can come in various types (light, electron and stereo microscopes) with each suited for different purposes and levels of magnification. Transforming Ourselves, Transforming Our World  Antonie van Leeuwenhoek 1632-1723 He is a Dutch scientist and Entrepreneur The one who proposed a better use of lenses to understand the microbial world by inventing the microscope. Transforming Ourselves, Transforming Our World  Focus Knob Sample Lens Translator Sample Holder Robert Hooke 1635-1703 He developed the compound microscope, publishing his results in careful drawings of what he saw in his MICROGRAPHIA (1665) Transforming Ourselves, Transforming Our World  TYPES OF MICROSCOPE Transforming Ourselves, Transforming Our World  LIGHT MICROSCOPE It is usually found in most schools It uses compound lenses and light to magnify object. The lenses bend or refract the light, which makes the object beneath them appear closer. Transforming Ourselves, Transforming Our World  SCANNING ELECTRON MICROSCOPE (SEM) This type of microscope allows scientist to view much smaller objects to be seen with a light microscope. Transforming Ourselves, Transforming Our World  SCANNING ELECTRON MICROSCOPE (SEM) SEMs don’t use light waves. They use electrons (negatively charged electrical particles) to magnify objects up to 2 million times. Transforming Ourselves, Transforming Our World TRANSMISSION ELECTRON MICROSCOPE (TEM) This type of mcroscope also uses electrons, but instead of scanning the surfaces the way SEMs do, electrons are passed through very thin specimens. Transforming Ourselves, Transforming Our World  PARTS OF THE MICROSCOPE AND THEIR FUNCTION Transforming Ourselves, Transforming Our World EYEPIECE LENS This is the lens at the top that you look through Transforming Ourselves, Transforming Our World Eyepiece Lens HIGH POWER OBJECTIVE It is the longer of the two lenses close to the slide. Transforming Ourselves, Transforming Our World Objective LOWER POWER OBJECTIVE It is the shorter of the two lenses close to the slide. Transforming Ourselves, Transforming Our World Objective  BODY TUBE This connects the eyepiece to the objective Transforming Ourselves, Transforming Our World Body Tube COARSE ADJUSTMENT KNOB It allows the up-and-down movement of the tube Transforming Ourselves, Transforming Our World  Coarse Adjustment Knob FINE ADJSUTMENT KNOB This moves the objective lens or stage up and down to focus quickly It is used for the first step of focusing Transforming Ourselves, Transforming Our World  Fine Adjustment Knob  BASE This supports the entire microscope Transforming Ourselves, Transforming Our World Base  ARM This is used to hold the tube and the lenses, and it connects the base Transforming Ourselves, Transforming Our World Arm  NOSEPIECE This holds the objective lenses Transforming Ourselves, Transforming Our World Nosepiece  LIGHT SOURCE This provides illumination into the tube Transforming Ourselves, Transforming Our World Light Source  DIAPHRAGM This is a circular disk that regulates light that is passing through. Transforming Ourselves, Transforming Our World Diaphragm  STAGE This is the platform for the slide to rest. It has an opening at the center that lets light pass through. Transforming Ourselves, Transforming Our World Stage  CLIPS They hold the slide in place on the stage Transforming Ourselves, Transforming Our World Clips  MICROSCOPE HANDLING AND STORAGE Transforming Ourselves, Transforming Our World MICROSCOPE HANDLING Most microscope issues are caused by incorrect handling. Always hold the microscope by the base and the metal support arm when transporting it. Transforming Ourselves, Transforming Our World MICROSCOPE HANDLING Do not pick it up by lightly grabbing the stage, because this may cause the mechanical stage to misalign Transforming Ourselves, Transforming Our World MICROSCOPE HANDLING If you will be transferring the microscope from one area to another frequently, you might consider acquiring a microscope carrying case. Transforming Ourselves, Transforming Our World MICROSCOPE STORAGE When not in use, keep the microscope protected with the dust over, even if its is placed inside a cabinet. Transforming Ourselves, Transforming Our World MICROSCOPE STORAGE Do not keep it without any eyepieces. This might cause dust cover to accumulate within the eye tubes, making cleaning difficult. Transforming Ourselves, Transforming Our World MICROSCOPE STORAGE If the microscope eyepieces must be removed, simply wrap the tubes with caps or a plastic bag covered over the eye tube with a rubber band. Transforming Ourselves, Transforming Our World