2006-08-17 10:46:03 · 6 answers · asked by mike 1 in Science & Mathematics ➔ Biology
First you have to start on the lowest power possible focusing with the large round turning mechanisms(sorry I don't know the names of them) then you find adjust the focus with the smallest focus with the smaller focus mechanism. Then you put it to the next power up. Fine adjust the focus again, do not touch the larger focusing mechanisms(you can really damage the lens). After that is done move if to the next highest power and adjust the fine focus again. There is an oil Emerson on most microscopes but you would need oil for this power. IF you don't have oil then don't try that power. If you do have oil then put the oil on and then switch the power. Again use the fine focus again and NEVER touch the larger focus mechanism because that can break the oil Emerson.
2006-08-17 14:06:08 · answer #1 · answered by Megan B 1 · 0⤊ 0⤋
Hi. A really high powered lens may use a drop of clear oil to improve light transmission, but the focusing technique is still the same. Move the lens as close as possible while looking at the side. Make sure you know which way to turn the focus knob to move the lens away from the cover slide or specimen. Slowly move the lens away from the slide while looking through the microscope. The specimen will come into focus at one plane. By moving the lens up or down you can examine the top and sides of whatever you are looking at.
2006-08-17 11:03:19 · answer #2 · answered by Cirric 7 · 0⤊ 0⤋
Well, I'll tell you how *NOT* to. Never turn the main focusing knob away from you while looking through the objective lens; sooner or later you'll hear a horrible cracking noise followed by a very unhappy professor.
Usually I (used to) put the lens almost onto the slide with visual guidance, then slowly back the focus away until something came into view. After that, only use the fine focus knob for, well, fine adjustments - never more than one half turn in either direction.
IME the 'auto focus' (or whatever you call it) never worked well between the mid range and high power focus; I always had to manually readjust the high power.
2006-08-17 18:02:46 · answer #3 · answered by dukefenton 7 · 0⤊ 0⤋
I'm not sure if this answers the question, but most microscopes are parfocal. That means it holds focus as you change objectives. You would bring it into focus at the lowest power, then bring it up through each objective, using the fine focus to make minor adjustments each time. Then in your going at the highest power of a typical microscope, 1000X (100X objective with at 10X eye piece), you would use oil to reduce the light refraction.
That may not be the answer to the question, but it's how it's actually done in most places.
2006-08-17 13:38:16 · answer #4 · answered by lizettadf 4 · 0⤊ 0⤋
High Power Lens
2016-11-02 23:45:07 · answer #5 · answered by ? 4 · 0⤊ 0⤋
I learned this in anatomy class...
The highest power on the lens is called "oil immersion". You don't usually use this lens in class.
http://darwin.baruch.cuny.edu/bio1003/microscope.html
2006-08-17 10:57:52 · answer #6 · answered by alwaysbombed 5 · 0⤊ 0⤋