Biology - Microscopes 0.0 / 5 ? BiologyAdaptations of organisms to their environmentGCSEAQA Created by: LunaShomeiRoseCreated on: 13-10-18 16:44 What microscope is commonly used in school? Optical 1 of 26 Where do we place the microscope slide? On the stage. 2 of 26 The stage has ___ to hold the slide down. Clips 3 of 26 The lamp is below the ___ Stage 4 of 26 What does the lamp do? Shines light so it passes through the slide 5 of 26 Some microscopes have a mirror instead of a lamp. The mirror can be used to reflect the light instead. What type of microscope has a mirror? Optical. Some optical have lamps, some have mirrors. 6 of 26 What's above the stage? Objective lenses 7 of 26 How many are there? 3 8 of 26 What are the three magnifications? 4x 10x 40x 9 of 26 Some microscopes, such as the optical one, have limited resolution. What is meant by this? Image is blurred 10 of 26 At the top of the microscope is the ___ (where you look down) eyepiece 11 of 26 The eyepiece lens has a mag. of... 10x 12 of 26 There are two dials on a optical microscope. One is large and short, and one is thin and tall. Which one's which? Coarse focusing dial is the larger one. Fine focusing dial is the thinner one. 13 of 26 What does the coarse dial do? Lowers/highers the objective lens. 14 of 26 What does the fine dial do? Focuses the lens clearly 15 of 26 To view a prepared slid with the microscope, what do you need to do first? Place slid on stage, and use clips to secure it. 16 of 26 Then which lens should you use the view the slid first? Lowest power one (4x) 17 of 26 How do you position the lens? Just above slide by using the coarse focusing dial, watching from the slide for accuracy 18 of 26 Why shouldn't you look down the eyepiece when lowering lens? Risks damaging the slid 19 of 26 We now look down the eye piece and higher the lens until it comes into focus. We then use the fine focusing dial to... Bring it into clear focus 20 of 26 How do you calculate magnification from knowing an image size and the real size? image size / real size = mag 21 of 26 How do you calculate total mag. from the lenses mag.? Times the eyepiece with objective lenses mag (e.g 10x times 4x) 22 of 26 What's the advantage of using an electron microscope instead of an optical? Electron has better mag. and reolution 23 of 26 What would you be able to see in an anime cell with an optical microscope? Cell membrane, cytoplasm, nucleus and maybe mitochondria 24 of 26 What about in a plant cell? Cell wall, cytoplasm, nucleus and maybe vacuole and chloroplast 25 of 26 An image size is 45mm. The actual size is 0.01mm. Calculate mag. 45/0.01 = 4500X 26 of 26
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