What is the total magnification of a compound microscope with 10x ocular and 40x objective lens?

The total magnification depends upon the power of the ocular times the power of the objective lens. So in a typical lab microscope you would likely find a 10X ocular and three or four objective lenses: 4X, 10X, 40X (45X in some scopes, and 100X. The total magnification for each of these would be 40X, 100X, 400X (450X), and 1000X. Some older scopes have 47X and 97X as objective lenses so those would be 470X and 970X. If you need the total magnification for the microscope you used, you’ll have to get it from the microscope itself! To calculate the total magnification, you multiply the power of the ocular lens by the power of the objective lens. For example, if your ocular lens has a power of 10x and your objective lens has a power of 5x, your total magnification will be 50x. Do that simple task for each of what you asked and you will be good to go. Don’t forget to include the “x” in your answers.

M = Mo x Me find Mo the object is placed just outside the focal length of objective lens Mo = – di/do and di = 16 cm , do = 0.8 Mo = – 16 / 0.8 = -20 find Me the object (the image from objective lens) is place just inside the focal length di = -25 cm , do = 2.5 cm Me = – (-25) / 2.5 = +10 so

M = -20 (+10) = -200

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Magnification:

Figuring Total Magnification

Magnifying Objects/ Focusing Image:

When viewing a slide through the microscope make sure that the stage is all the way down and the 4X scanning objective is locked into place.
Place the slide that you want to view over the aperture and gently move the stage clips over top of the slide to hold it into place.
Beginning with the 4X objective, looking through the eyepiece making sure to keep both eyes open (if you have trouble cover one eye with your hand) slowly move the stage upward using the coarse adjustment knob until the image becomes clear. This is the only time in the process that you will need to use the coarse adjustment knob. The microscopes that you will be using are parfocal, meaning that the image does not need to be radically focused when changing the magnification.
To magnify the image to the next level rotate the nosepiece to the 10X objective. While looking through the eyepiece focus the image into view using only the fine adjustment knob, this should only take a slight turn of the fine adjustment knob to complete this task.
To magnify the image to the next level rotate the nosepiece to the 40X objective. While looking through the eyepiece focus the image into view using only the fine adjustment knob, this should only take a slight turn of the fine adjustment knob to complete this task.

Total Magnification:

To figure the total magnification of an image that you are viewing through the microscope is really quite simple. To get the total magnification take the power of the objective (4X, 10X, 40x) and multiply by the power of the eyepiece, usually 10X.

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