Couse focus knob
You use the fine adjustment to focus in HIGH power with a compound microscpe.
coarse
the magnification power of a microscope
It can burn your eye.
Because it is too hard to find a specimen on high power. Easier to find them and focus them on low power and then increase the magnification and fine-tune the focus to get a better, closer look.
it is how you operate the microscope just adjust he course adjustment knob for focusing the fine adjustment knob
You need to rotate the lenses round to get the best magnification then use the wheels on the side to bring it into focus. If this does not meet your requirement's then you need a better microscope.
It means you have a good microscope.
Multiply the magnification or power of the objective lens times the power of the eyepiece and it equals the total magnification
You use the fine adjustment to focus in HIGH power with a compound microscpe.
If magnification increases ONLY, then resolving power does not increase. However, if the magnification increased while staying in focus (upgrading resolution and magnification with objective lense), shorter wavelengths are needed to stay in focus with increased magnification to yield the same high resolution as with previous objective lense, so this case, resolving power does increase.
coarse
The specimen should be in clear focus
Because you are at the highest magnification, only turn the fine adjustment knob when you are using the high-powered objective lens, and not the coarse adjustment. Otherwise you risk getting your sample out of focus, and you will probably only be able to refocusby starting with the lowest power objective lens.
using the course adjustment to focus the specimen under high power
Course adjustment
On a the microscope I use, the ocular (eyepiece) has a magnification power of 10x. The 'low' (or 'scanning') objective lens is 4x, the 'medium' has a power of 10x, and the 'high' has a power of 40x. Multiply the ocular by the lens you're using to get your 'total magnification.' TIP: Only use the coarse adjustment knob while on 'low' power, then use the fine adjustment. Why? If you use the coarse adjustment knob on 'medium' or 'high,' there's a good chance you'll crack your slide. -BugCrunch