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The fine focus knob is used to bring an object into fine focus, while the course focus knob is used to bring an object into approximate focus. The course focus knob should only be used on the low-power and scanning objectives of the light microscope. Using it on the high power microscope is okay, but you should be very careful. It is no recommended to use the course adjustment knob on the oil-emersion objective as it is so close to the stage and could lead to a potential break in the slide. Fine focus adjustment knob is useful to bring out the fine details in the specimen on your slide. Can be used on any of the objectives, but most receptive on the high-power and oil-emersion objectives.
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoThese knobs are used to focus the equipment on the preparation.
The coarse for "coarse" or general focusing to get an image in the ocular.
The fine to refine the focus and to keep the object of interest sharp in the field of view.
Wiki User
∙ 15y agoim not sure just make sure its not to high
Wiki User
∙ 14y agoFine focus use in microscope to view the specimen more clear to observe under low power or high power.
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What is the knob you turn first to bring s slide to focus?
You use the coarse adjustment first.
What happens if you try to use the coarse adjustment when the 10x lens is in place?
One thing that can happen if you use the coarse adjustment while the oil immersion objective is in place is that the slide will end up breaking. It is better to use the fine adjustment.
How should the course adjustment on a microscope be turned under low power?
I'm not sure if I understand the question. When using a compound microscope, you always want to start by adjusting the coarse adjustment under low power (like 4x) until you have whatever you are looking at in focus. Then, without moving the adjustment, go to the next power (like 10x or something) and use the coarse adjustment only a little and then use the fine adjustment to get it into focus again. Without touching anything, switch to the next power (say 40x) and DO NOT TOUCH THE COARSE ADJUSTMENT. You will lose your object and have to start all over. Only use the fine adjustment past this point. Again, focus as best as you can. This will depend on the microscope, but some also have a 100x power objective lens. It is best to put a drop of immersion oil onto your sample while you move from 40x to 100x. Then you should only use the fine adjustment a small amount to get your sample into focus. The immersion oil improves the resolution of the image that hits your eye, making it easier to see and not blurry.
What part of the microscope should you used to focus the image when using high power objective lens?
First of all, one should never call it high power, it is morecommonly called the "high objective", yet that is not what this question is asking. To answer the question: You use the fine adjustment knob. This knob should be located near the coarse adjustment knob, on the opposite side of the microscope (at the same height as the coarse adjustment knob), or even as a separate knob protruding from the coarse adjustment knob. The fine adjustment knob is smaller in size. You should never, ever use the coarse adjustment knob under the high objective, you could scratch the microscope slide, cover slip, high objective lens, or in a worst case scenario break the high objective lens.
Which objective should the coarse focus knob be used?
The coarse adjustment knob is only used with the low-power objective lens (usually 4x) because all the other ones are too long and the coarse adjustment knob may bring the slide up too qucikly, therefore it might break the slide or crush the specimen being observed. When using the medium (10x) and high (40x) power objective lens, it is best to use the fine adjustment knob to focus on the details instead.
What is the procedure for focusing a microscope using the coarse and fine adjustment knobs?
a good way that works for me is use the coarse adjustment till you can start to see something then use the fine adjustment to get it into focus.
What two structure on the microscope will you use to focus on your specimen?
First use the coarse focus followed by the fine focus.
What structures on the microscope will you used to focus on your specimen?
First use the coarse focus followed by the fine focus.
What is focus knobs?
focus knobs are the things you use to focus stuff on a microscope.
What two structures on the microscope will you use to focus on your specimen?
eye piece, lens and fine adjustment, focus adjustment
What is coarse focus used for?
Coarse focus on a microscope is used only when you are using the lowest objective lens. You use it to get the object magnified mostly. The fine focus is then used to adjust the resolution to the viewer's eyesight.
What is the name of the control knob used for sharp focusing a compound microscope?
There are two knobs. The "coarse focus" knob changes the focal length very quickly, so you use that to get a close to sharp image. Then, you use the "fine focus" knob to perfect the image. Both knobs do the same thing, just at different rates. Resource: http://shs.westport.k12.ct.us/mjvl/biology/microscope/microscope.htm
Why do you have to be carefull when you are focusing the high power lens?
On a microscope, you have to make sure to use the fine focus instead of the coarse focus. If you are not careful and you do use the coarse focus, it will move the barrel down and the lens may crush your slide/slide cover. Which is very, very bad.
What is coarse used for?
Coarse focus on a microscope is used only when you are using the lowest objective lens. You use it to get the object magnified mostly. The fine focus is then used to adjust the resolution to the viewer's eyesight.
When using a microscope what should the slide be placed on for viewing?
Ideally, the microscope should be returned to its lowest-magnification objective when the user finishes his or her work. Because not all users abide by this unwritten law, it's best-practice to use the "Fine Focus" knob (the smaller diameter of the two, usually farthest from the body of the scope) when first sitting at a microscope you don't own. This will prevent the sample from breaking because you've accidentally moved the stage (the moveable, horizontal part of the microscope on which your specimen sits) too rapidly after the last use took off, leaving the objective at 40x (400x total magnification in most instances). If you verify that the objective turret is set such that the lowest magnification objective is in place, you can usually safely use the larger knob located closer to the body of the 'scope (but on the same axis as the fine knob) to bring your sample into focus. As you move to higher powers, the fine is all the adjustment you should need. COARSE, you didn't even end up answering the question previous writter! seriously!!!!! i agree with you 2nd writer!!!!
When focusing the object under low power which focus knob do you use first?
Either Fine or Coarse adjustment.
Which is more better to use a coarse or a fine adjustment knob?
Use a coarse adjustment knob (large movement) to get near, then use the fine adjustment knob (small movement) to fine-tune.
