lab practical 1

stereomicroscope and the scanning electron can view
surface and or three dimensional of an object
compound light microscope and transmission electron microscope view
extremely thin sections of a specimen
what is a longitudinal section cut
a lengthwise cut through any type of specimen
what is a cross section cut
a crosswise cut through any type of specimen
are biological objects small or large
small
light microscope uses
visible light rays magnified and focused by lenses
stereomicroscope studies
entire objects in 3d and low magnification
compound light microscope used
for examining small or thinly sliced sections of an object under higher magnification
compound refers to
use of two sets of lenses
photomicrograph
photograph of an image produced by compound light microscope
stains or dyes that bind to cellular structures and absorb light
microscopist
minium distance between two objects at which they can still be seen or resolve
Resoilution
do small organisms require low or high magnification
low magnification
compound light microscope are
parfocal
once the object is in focus with the lowest power, it should also be in focus with the higher power
parfocal
how is total magnification calculated
mutiply magnification of ocular lens by the objective lens magnification
what is a microscopes field of view
the circle visible through the lens
what type of microscope would you use to view a Euglena swimming in pond water
compound light microsscope
what are ocular lenses
eyepiece
which part of a microscope controls the amount of light
diaphram
what word is used to indicate that if the object is in focus at low power it will also focus in high power
parfocal
what adjustment knob is used with high power
fine adjustment knob
if euglena is swimming to the left, which way should you move the slide
right
what is the final item placed on a wet mount before viewing with a light microscope
coverslip
what type of object do you study with a stereomicroscope
entire object
why is a stereomicroscope also called a binocular dissecting microscope
each microscope receive its own magnified image and provides depth of field for viewing objects
a virus is 50 nm in size, what type of microscope should be used
scanning electron is below the frequency of light
what advantages does the metric system provide over english units of measure
1. its easier for some to convert
2. also more accurate