An example is methylene blue.
Methylene blue is an example.
Stain
An exemple is methylen blue.
Its a Light Microscope! (=
The general term is 'stain' of which there are several chemicals that can be used, depending on the specimen.
It helps some parts of the specimen to become more visible under the microscope.
immersion oil
Because the smallest wavelength of visible light we can see is around 400 nm. Something 200 nm would need an electron microscope to be seen.
To provide light which makes specimen visible .
A Dark Field microscope is one that has a special condensor (light source) that illuminates the specimen in such a way as to enhance the contrast even if it is unstained. When you look at a specimen in a dark field scope, it looks bright, but it is visible against a black background -- the 'dark field.'
to generate light, so the specimen can be examined (sends light through base, diaphragm, stage specimen, slide, objective lens, nose-piece, body, body tube, and eyepiece)
It magnifies the specimen by a certain degree to make it appear larger and let you see more detail which were not visible to the naked eye. It is done with the help of lenses which are aided in microscope