It Advances the Vision and Makes appear bigger and More Clear.
The view of an image becomes lager as the increase in magnification power enlarges the specimen in terms of appearance. Thus, allowing to view a lot more clearer image with a lot of minute details.
The visibility of the specimen decreases as the power of magnification increases on a microscope. The specimen area will shrink as the magnification is increased.
The oil immersion lens or objective has power 90X-100X and an eyepiece lens generally in light microscope comes with 10X so total magnification of oil immersion lens is 100X10 = 1,000
In a light microscope magnification is varied by using different lenses to refract the light. In an electron microscope magnification is varied by altering the configurations of magnetic fields to bend the electron beam.
It depends on what magnification the ocular lens is (usually 10x), then you multiply that by the objective lens magnification (what you said to be 40x). So the microscope would magnify your specimen by 400 times.
The power of a light microscope can be determined by multiplying the magnification power of the eyepiece by the magnification power of the current lens. Ex. (10x) by (40x) results in in a 400x magnification.
To increase the magnification of the specimen so you can see more detail.
The magnification of the specimen under low power optics, lpo, is 10 times and the magnification of the specimen under high power optics, hpo, depends on the power of the microscope but is usually at least 500 times or more.
It means you have a good microscope.
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.
When locating a specimen,the magnification use is low objective lens of 10*.
The specimen should be in clear focus
The visibility of the specimen decreases as the power of magnification increases on a microscope. The specimen area will shrink as the magnification is increased.
Feild of veiw. Kittyanswers
The high power objective increases the magnification of the specimen (it contributes to a further magnification). It magnify specimens at greater resolutions, which allows you to see fine details.
400x
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.
In a light microscope when magnifiaction increases resolution decreases and the object will apear blurred. It can be removed by putting immersion oil on slides or object which increase the refractive index and cause to increase the numerical aperture which ultimately cause the better resolution as resolution power depends on numerical aperture of lens. The immersion oil used can be cedar oil.