4.1 Cell Biology - Microscopy 0.0 / 5 ? BiologyCells, tissues and organsGCSEAQA Created by: KieraHollings_Created on: 31-12-17 15:40 When was the first light microscope developed? Mid 17th century 1 of 11 How do light microscopes work? Use a beam of light to form an image 2 of 11 what is the highest a light microscope can magnify? 2000 times (resolving power of 200nm) 3 of 11 Advantages of light microscopes? Relatively cheap and can magnify live specimens 4 of 11 When was the electron microscope invented? 1930s 5 of 11 The electron microscope allowed biologists to look at the _____ structures inside cells sub cellular 6 of 11 How do electron microscopes work? Use a beam of electrons to form an image 7 of 11 What is the highest an electron microscope can magnify? 2,000,000 times (resolving power of 0.2nm) 8 of 11 Compare transmission electron and scanning electron microscopes T.E microscopes form a 2D image with very high magnifications and resolution. S.E. microscopes give dramatic 3D images but lower magnifications 9 of 11 Disadvantages of electron microscopes? Large, very expensive, and have to be kept in special temperature, pressure and humidity controlled rooms 10 of 11 how do you calculate magnification? Magnification = size of image / size of real object 11 of 11
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