Microscopes Flashcards
Why is it a conventional unit of measurement?
Too large to measure
What is the unit of measurement?
Microns
How many microns in 1mm?
1000 microns
Define micrograph
Photograph of a specimen viewed under microscope
What does one measure cell in?
Milimetre
How do you convert mm into microns?
times by 1000
How do you convert microns into mm?
divide by 1000
Define microscope
Instrument that uses a lens or combination of lenses to produce magnified images of small objects
What does the microscope allow you to do?
Look at small things with the naked eye
Define magnifying lens
A piece of glass that is specifically curved to produce an enlarge image of object
What is a compound microscope?
More than one lens and light to view specimen
What is a electron microscope?
Beams of electrons
Define ocular lens
Lens that you look through to view enlarged object
What is another name for ocular lens?
eyepiece
How much does the ocular lens magnify by?
10x
What is the body tube?
Lens that magnify object. Passes light from head to eyepiece
What is the rotating head?
Contains mirrors, allows body tube to rotate 360 degrees
What is the rotating nosepiece?
Structure that rotates. One of three different lens to view specimen
Define objective lens
Lens closest to specimen
Define objective lens
Lens closest to specimen
How many objective lens are there?
Three that are attached to rotating nosepiece
Label the three objective lens
- Low magnification (red) 40X
- Medium magnification (yellow) 10X
- High magnification (Blue) 4X 
Which lens produces the most magnification?
Objective lens
Define stage clamp/clip
Holds down the microscope slide into olace
What is the diaphragm?
Adjust amount of might passing through microscope
What type of dial is on the diaphragm?
Rotating and number dials
What are number dials?
Relative amount of light passing
What is the number for the highest light passing?
5
What is the number for the lowest light passing?
1
What is the condenser?
Focuses light into specimen. Condenses light
What is the mirror?
Directs light up - light source illuminated
What is the base?
Support lenses and stage. Supports microscopes which contain electronics
Define stage
Platform slide is place on
What does the stage contain?
Opening
What is the opening on the stage used for?
Allow light to pass through specimen
What is the arm?
Supports the lenses, mirrors and body tube
What does the arm connect?
Body tube to base
How do you carry the microscope?
One hand on arm and one on bade
What does turning the fine focusing knob do?
Changes distance between stage and objective lens
How fast should you make focus adjustments in the fine focusing knob?
Slowly
What type of objective is the fine focusing knob?
High power objective
What is the coarse fixing knob?
Trying knob changes distance between stage and objective lens quicjly
What type of focus is the fine focus knob?
Clear focus
What type of focus is the coarse focus knob?
Rich focus
What type of power objective is the coarse focus knob?
Low power objective
Define wet mouth slide
Glass slide holding a specimen suspended in a drop of water and with a cover slip
How is the specimen seen on microscope?
Specimen placed in a drip of liquid on microscope slide
What is the liquid used on a slide?
Water
What may be added to water?
Dye
Why would dye be added to water?
Stain cells/part to be visible
Formula magnification of specimen
Magnification if ocular lens X magnification of objective lens
Formula for actual size of cell
Measure length X 1000 divide by given magnification
