When you are focusing on a object in which order should the three objective lenses always be used?

When you are focusing on a object in which order should the three objective lenses always be used?
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A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution? (a) Blue (b) Green (c) Yellow (d) Red

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Last Answer : (A) 4

Why should you always begin to use a microscope with the low-power objective?

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Last Answer : because it allows you to find the part of the slide you want tosee, then you can zoom in by changing focus to see the frame ingreater detail. if you don't start in low power it is extremelydifficult to move around the slide