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An objective lens gathers light passing through the specimen on the microscope and projects the image into the body of the microscope. Objective lens are closest to the specimen.
The light is reflected upwards, and passes through the specimen. It passes through easier (clearer) if the specimen is not too thick.
Specimen
The answer you are looking for is called a dissecting or stereo microscope. These provide a lower magnification range in comparison to compound microscopes and they use two sets of lenses, the eyepiece and the objective lenses. these then provide a 3D image.
Field
It depends on the particular microscope, and the magnification being used. Without these details, this question cannot be answered.
microscope
A transmission electron microscope (TEM) is a microscope in which a beam of electrons is transmitted through an ultra-thin specimen, interacting with the specimen as it passes through it.
Light microscope works because light goes *through* your specimen. So if the specimen is too thick, then light won't shine through, and you won't see anything.
An objective lens gathers light passing through the specimen on the microscope and projects the image into the body of the microscope. Objective lens are closest to the specimen.
because the specimen is always thin
The specimen prepared for a monocular microscope must be very thin so light can pass through it easily. The light then goes through a series of lenses that magnifies the specimen to appear bigger
The answer to this microscope question is the stage opening.
It regulates the amount of light that passes through a specimen.
Looking through a microscope, most animal cells are pretty much entirely transparent unless you dye them.
the diaphragm