Portage Microbiology Lecture Exam 3 Questions and Answers with Verified Solutions | Latest Updated 2026

Portage Microbiology Lecture Exam 3
Questions and Answers with Verified
Solutions | Latest Updated 2026



micrometer one millionth of a meter



nanometer one billionth of a meter



two critical factors that influence resolution and contrast
our
ability to see an object


resolution the distance between two objects at which
the
objects still can be seen as separate


contrast the difference in light absorbance between
two
(objects)


the closer two objects are to each greater
other the __________________
the resolution
requirement

, the ________________ the lower
contrast between
an object and its background, the
harder it will be to see the object


bright field microscope simplest form of light, or optical,
microscopy/light,
most often emitted from a standard
halogen bulb,
enters the microscope from the base
(bottom) and
is reflected via mirrors towards the sample


before the light reaches the condenser
sample,
it first passes through a
________________
converging the light beams into a
focused area on the sample


iris diaphragm controls the amount of light that passes
through
the sample and into the objective lens


objective lens the lens closest to the sample and yields
the
greatest amount of magnification