Best Answer:A low power objective is essential on any microscope, It allows you to quickly . A low power objective is essential on any microscope, It allows you to quickly scan a large area of the specimen, and to locate those areas which need closer study with a high power objective. For example, a histologic section of liver might measure 20 by 40 mm. With a 4x objective you can scan the entire piece of tissue in a minute or less. If there is a 1 mm tumor somewhere in the section, you will find it during this scan, and can them zoom in on it with the high power objectives.
Trying to scan the entire slide with a 40x objective would take a long time because in any given field you can see only 1/100 the surface area included in a 4x scan), and you could easily miss a 1 mm tumor entirely. The usual lab microscope contains,ocular lens which magnify 10 times,and low power objective add another 10 magnification so the magnification becomes 10 x 10=100. Also, there is the scanning objective, which is smaller than the low-power objective.You can look at a large area and find a small item in it that you might want to take a closer look at. You then switch to higher power objectives to “zoom” in on the details of that section making them 10 or 100 times bigger in your eye’s view.
If you start out at a high power objective, then you will only see a physically small space and would never find the point of interest.Remember: low power, large area of view. High power, small area of view!The low-power objective allows for high-resolution, low-magnification examination of an object. You can easily see the “larger” details of the object, and you can see more (if not all) of it, instead of having to change its position.
The standard laboratory microscope is outfitted with an ocular lens that provides a magnification power of 10x. The total magnification power can be found by multiplying the ocular magnification by the magnification of the selected objective. This means that the total magnification of the ocular lens and the low-power objective would be 10 x 10 = 100x. A smaller objective than the low-power objective is known as a scanning objective.
