compound microscope, has two or more lenses, convex lens, -used to bend light rays -makes objects look larger, concave lens, a lens that bends outward; thicker in the middle than at the edges, eyepiece, -part of microscope you look through -lens in eyepiece has a magnifying power of 10x, objective lenses, -3 objective lenses -always use in this order; red to yellow to blue, dimmer dial, -controls the brightness of the light -always start with light at its dimmest, scanning (red) lens, -4x magnification -always start with this lens to find specimen -then make sure it is in the middle of the field of view, low power (yellow) lens, -10x magnification -use this lens after centering your specimen with the red lens, high power (blue) lens, -40x magnification -this is the last lens we use -never turn the coarse adjustment knob when using the higher power lens, total magnification, -multiply the magnification of the eyepiece by the magnification of the objective lens -ex. eyepiece x scanning lens 10 x 4 = total magnification 40x, coarse adjustment knob, -bigger knob-makes big changes to what you are seeing -never use this knob with high power, fine adjustment knob, -makes small changes to what you are seeing -brings out sharp details of your specimen -use after the coarse adjustment knob, looking at words, word will appear upside down and backwards, centering a specimen, when centering your specimen, move the slide in the opposite direction

How Microscopes Work

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