3 Target #9- I can describe the compound light microscope Microscopes are tools that extend our vision by making objects like cells, and atoms visibleCompound Light MicroscopeShines light through a specimen and has two lenses to magnify an imageSpecimens must be mounted on a slideSpecimen must be thin enough for light to pass through
4 Target #10- I can describe the 4 basic parts of a light microscope There are 4 major parts of a compound light microscopeEyepieceAlso known as the ocular lensMagnifies the image 10 times (10x)Objective LensLight passes through the specimen and then through the objective lensLocated directly above the specimenEnlarges the image of the specimenStageA platform that supports a slide holding the specimenLight sourceEither a light bulb or light reflected
5 Target #11- I can label all the parts of a light microscope Ocular lens (Eyepiece)Body TubeARMNosepieceOBJECTIVE LENSESSTAGESTAGE CLIPSCOARSE ADJUSTMENT KNOBDIAPHRAGMFINE ADJUSTMENT KNOBLIGHT SOURCEBASE
6 Target #12- I can explain how to calculate the power of magnification Microscopes vary in magnification abilitiesMagnification: the apparent increase of an objects sizeThe degree that an object is magnified in a microscope is called the power of magnificationTo compute the power of magnification of a microscope, multiply the magnification of the strongest objective lens by the power of the ocular lensEx: if the strongest objective lens is 100x magnification, multiply by the objective lens which is usually 10x, then the total magnification is 1,000x
7 Checking for Understanding On a light microscope an objective lens magnifies the view of some pond water 25 times, and the ocular lens magnifies it 10 time further. What is the final magnification of the image?
8 Target #13- I can describe electron microscopes To examine specimens in more detail, scientists commonly use an electron microscopeElectron microscopes use a beam of electrons to produce an enhanced image of the specimenMore powerful in magnification and resolution than light microscopesImages are produced in black and white, but are usually colorized to show detail via computerSpecimens are not living onesTwo typesScanning electron microscopeTransmission electron microscope