Scientific Measurement Bell Ringer What are the two different types of microscopes? What are these? Conversions K HDbd cm Group Challenge 7m = _____ Kilometers 2.3L = _____ milliliters 1750g = _____Kilograms 250cm = _____ Meters History of the Microscope Invented between 1590-1600 Robert Hooke-1665 viewed cells for the first time Anton van Leewenhoek- first to describe bacteria Microscopes Light Microscope – light passes through one or more lenses to produce an enlarged image of a specimen. Light Microscope Use two lenses A light bulb in the base shines light up through the specimen mounted on a glass slide. The objective lens then collects the light, which then travels to the eye. Microscopes Electron Microscope – forms an image of a specimen using a beam of electrons rather than light. Can magnify up to 200,000x Living things can’t be seen under an Electron microscope because the specimens have to be looked at while in a vacuum. Electron Microscope Microscopes Magnification – is the quality of making an image appear larger than its actual size. Resolution – Is a measure of the clarity of an image.