Assuming you mean μm - It stands for micrometre - a measurement of microscopic distances. One micrometre is a millionth of a metre.
.2 um
The resolving power of a compound microscope is the ability to distinguish two closely spaced objects as separate entities. It is determined by the numerical aperture of the objective lens and the wavelength of light being used. The higher the resolving power, the greater the level of detail that can be observed in the specimen.
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Um - that would be Ray Ban!
To find the new field of view at 400X magnification, you would divide the original field of view by the magnification increase factor (which is 10 in this case since you are going from 40X to 400X). So, 6000 um / 10 = 600 um. Therefore, the field of view at 400X magnification would be 600 micrometers.
A resolution of 0.2 um means that the microscope can distinguish between two points that are at least 0.2 micrometers apart. In other words, it can visualize fine details very closely spaced together. A smaller resolution value indicates higher resolving power.
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When using a light microscope, you would generally mark off length in micrometers (um). However, scanning electron microscopes can go down to picometers (pm) or even smaller depending upon what is being measured.
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Um, why don't you try wiping....