PPT NI BASAS Flashcards
The objective lens
forms the magnified
real image
image is
a product of the
separate magnifying
powers of the two
lenses
Total magnification
Numerical aperture of lens ranges from
0.1 to 1.25
formula for quantifying resolution
RP = wavelength of light in nm/2x numerical aperture of objective lens
Oil immersion objectives resolution is
0.2
In order to get the best resolution possible with a
light microscope, you would want:
A. Long wavelengths of light
B. Short wavelengths of light
C. The wavelength doesn’t affect resolution
B
when a specimen is
darker than surrounding field and used used for live and
preserved stained specimens, what type of microscope is this
Bright-field
best for observing
intracellular structures
phase contract
this microscope is useful in diagnosing
infections
fluorescence microscope
electron micro scopes magnification is about
5,000X and 1,000,000X
Darker areas represent
thicker, denser parts
and lighter areas
indicate more
transparent, less dense
parts. what type of microscope is this
transmission
allow examination of characteristics of live
cells: size, motility, shape, and arrangement
wet mounts and hanging drop mounts
are made by drying and
heating a film of specimen.
fixed mounts
cationic,
positively charged
chromophore
basic dyes
surfaces of microbes are
negatively charged and
attract basic dyes
positive staining