Parts of the microscope Flashcards
where the eyepiece is viewed through
Eyepiece
is attached on top of the arm. It can be of the monocular or binocular type. It supports the eyepiece on the upper end.
Microscope tube
is attached under the arm of the microscope tube. This houses the objectives and rotates them
Nosepiece
is the distance between the place where the objective is inserted and the top of the drawtube into which the eyepieces fit.
Mechanical tube length
Where the image of the specimen first passes through
Objectives
is the measure of light-gathering power of a lens.
Numerical Aperture
a high resolving power and thus useful magnification
Indication of high NA
placed between the slide and the oil immersion objective to provide the best image at high magnification
Immersion oil
holds the slide and allows it to be moved to the left, right, forward, or backward by rotating the knobs.
It is fitted with fine vernier graduations as on a ruler.
Mechanical Stage
illuminates the specimen and controls the amount of light and contrast.
Condenser
is provided below the condenser. This adjusts the NA of the condenser when using objectives having low magnifying power.
Iris diaphragm
provides necessary illumination through reflection of natural or artificial light.
Two-sided mirror
is built into the base of the microscope
Illuminator
provides the best illumination.
Halogen bulb
are used to change the light from ordinary electric bulbs into a more natural white light.
Blue filter
are used to reduce brightness without changing the color of the background.
Neutral density filter
may be useful in some situations.
Green filters
must be used with objectives having NA more than 1.0.
Immersion oil
are used to change the distance between the specimen slide and the objective.
Course and fine focusing knob
changes the distance very slowly and permits better viewing of the object.
Fine focusing knob
are low wattage, high intensity lamps and are the preferred light source.
Halogen lamp
