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observation of microbs lab practical microbiology

Terms in this set (12)

why is a specimen smaller than 200nm not visible with a light microscope?
anything smaller than 200 nm cannot interact with visible light
what happens to the light rays when they hit the specimen?
they are reflected, refracted, or absorbed by the specimen
what is the role of the ocular lens?
to recreate the image in the viewer's eye
what is meant by the light rays being divergent?
it is spreading out
in a typical brightfield microscope (seen in the animation), at what point does magnification begin?
the objective lens
why do electron microscopes have higher resolving power than light microscope?
electrons have a smaller wavelength than visible light, leading to higher resolution
what kind of lens is found on EMS and not on LMS?
projector lens
what kind of miscroscope will allow you to see ribosomes inside cell?
Transmission electron microscope
which of the following is a characteristics shared by both EMS and LMS?
they both employ the use of objective lens
What is the fate of the electrons that interact with a specimen in an EMS?
They may be absorbed, reflected, or refracted by the specimen.
what does resolution mean?
ability of a microscope to distinguish fine details and differentiate between two very close objects
Which of the following describes the correct path of light in a compound light microscope, from the illumination source to the eye of the observer?
illuminator ( condenser lenses ( specimen ( objective lenses ( body tube ( ocular lens ( eye
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