Parts of a Compound Microscope Chapter 3 Compound

Parts of a Compound Microscope Chapter 3

Compound Microscope • A microscope is a very powerful magnifying glass • A microscope helps you see things like cells up close

Eyepiece • View the specimen through the eyepiece

Stage Clips & Objectives • Stage clips hold the slide in place • Low power objective (the shorter one) is used to focus the microscope • High power objective is used to view fine details of a specimen

Coarse Adjustment, Fine Adjustment, & Base • Coarse adjustment focuses first • Fine adjustment fine tunes & gives detailed focus (usually smaller than coarse adjustment knob) • Base is where the microscope rests

Stage • Stage is part where the slide rests • Mirror (or light source) directs light upwards onto the slide.

Diaphragm • Diaphragm allows light in

Nosepiece • Nosepiece is the rotating device that holds the objectives (lenses)

Arm • Arm is the part where you carry the microscope

Can you name the parts of a compound microscope?

Answers 1) base 2) mirror (light source) 3) diaphragm 4) stage 5) stage clips 6) low power objective lens 7) high power objective lens 8) nosepiece 9) arm 10) fine focus knob 11) body tube 12) coarse focus knob 13) eyepiece

Identify the Parts of a Microscope Use Text pg. 688 to help you!

Answers Make corrections A. B. C. D. E. F. G. H. I. J. K. L. M. N. O. Body tube Nosepiece High power objective lens Stage Diaphragm Eyepiece Arm Stage clip Nothing Coarse adjustment knob Fine adjustment knob Base Low power objective lens Medium power objective lens Light source

Main Types of Microscopes § Light microscopes bend light rays through lenses. § They are powerful because you multiply the powers of each lens to get total magnification 10 x 20 x What is the TOTAL MAGNIFICATION? 10 X 20 = 200 x

Types of Microscopes Compound Light Microscope § Has more than one lens in a tube § Shines beam of light through specimen § Specimens usually have to be stained with a chemical so they can be seen § Can magnify from 10 x to 1000 x

Electron Microscopes § Electron Microscopes use a focused beam of electrons instead of light § Increased magnification (from 100, 000 x to 1, 000 x) § Unfortunately it kills the specimen if it is alive.

3 -D Images from a Scanning Electron Microscope

Scanning Electron Microscope

The SEM shows very detailed 3 -dimensional images at much higher magnifications than is possible with a light microscope. The images created without light waves are rendered black and white

Who am I? I’m a louse fly of a wallglider (an alpine bird)

Guess What? § You will have a QUIZ on these lecture notes (just microscope parts and functions!!!) on Friday, October 14 th! Omnis cellula, e cellula

27 How Big is a Nanometer? • Consider a human hand skin white blood cell DNA Source: http: //www. materialsworld. net/nclt/docs/Introduction%20 to%20 Nano%201 -18 -05. pdf nanoscale atoms

Sticky Spider Toes These are the single hairs (setae) that make up the tuft of hair on the bottom of a jumping spider’s foot. The oval represents the approximate size of the foot magnified to 270 x. Water strider toes help keep it dry, but this spider’s toes help make him sticky! This picture, magnified 8750 x, shows the very dense nanosized setules on the underside of just one of those many seta (hairs) shown in the picture above. http: //www. primidi. com/2004/04/26. html Tell me more!

Lots of nano-toes! • Beetles and flies also have nanostructures that help them stick to walls, ceilings and what appear to be smooth surfaces. Tell me more! • http: //shasta. mpi-stuttgart. mpg. de/biomaterials. html http: //shasta. mpi-stuttgart. mpg. de/research/Bio-tribology. htm

For Monday’s Lab. . . • Bring in some printed materials to look at in our lab (newspaper, magazines, comics, catalogs, stamps, etc. ) • Other good items to bring: pet hair, feathers, scales (put in a baggie and label so we know what it is!)