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3) What do we mean by ‘field of view?’ How does the ‘field of view’ change as magnification is increased? does this relate to the fact that one should always use the low-power scanning objective first to locate a specimen? What do we mean by ‘depth of focus?’ What happens to the ‘depth of focus’ as magnification is increased?How4) What is Köhler illumination and why is important? List the steps required to adjust the microscope for Köhler illumination.