read the situation and then write your answer.
Ana and Elsa are doing their Microscope activity in their biotechnology class.They want to observe and examine pollen grains of a flower.Why should they start with the lowest magnification setting when using a microscope?
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Answer:
The depth of focus is greatest on the lowest power objective. Each time you switch to a higher power, the depth of focus is reduced. Therefore a smaller part of the specimen is in focus at higher power. Again, this makes it easier to find an object on low power, and then switch to higher power after it is in focus. A common exercise to demonstrate depth of focus involves laying three different colored threads one on top of the other. As the observer focuses down, first the top thread comes into focus, then the middle one, and finally the bottom one. On higer power objectives one may go out of focus as another comes into focus.
Explanation:
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