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It means the specimen you are looking at is being magnified 150 times its normal size.
It depends on the particular microscope, and the magnification being used. Without these details, this question cannot be answered.
To provide light which makes specimen visible .
The scanning electron microscope is probably the answer you are looking for, in which a beam of electrons is bounced from the surface of the specimen - usually prepared with an incredibly thin film of metal over its surface to make the electrons bounce from the surface better and not penetrate the specimen too far - and the electrons imaged
they are relatively smaller, electron ones are biggerthey are easy to usethey allow you to see coloured images, electron ones don'tyou can observe live specimen, specimen has to be dead with electron microscopesi was trying to view the answer in relation to transmmission
The stage clip holds the the specimen slide firmly on the stage and is needed if the microscope is tilted.
reading and looking through a microscope
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.
There are hundreds stains for this light microscope. You can see some of them at the bottom link: http://www.laddresearch.com/General_Catalog/Chapter_2/LMStains/lmstains.html To select a stain first you have to now, what are looking for? Nucleus, membrane, protein, carbonhydrates...
A device put onto the stage to allow precise adjustments of the slide
first view with low power then gradually increase the power. hope it helped you!