MICROSCOPE Flashcards
=He is a Deutch scientist who used one of the microscopes to discover a whole new world of living organisms.
=He used SIMPLE MICROSCOPE
=observed tiny organisms in pond water and other substances.
Anton Von Leeuwenhoek
He is an English scientist, discovered that larger organisms have small microscopic subunits called “CELLS”
Robert Hooke
Made of a set of lenses. They are more powerful and more complex than those used by early scientists.
Compound Microscope
The set of lenses closest to your eye.
Ocular/Eyepiece
Holds the ocular in place.
Body tube
A turretlike circular mechanism rotates so that different lenses can be selected.
Revolving Nosepiece
True or False.
Always turn the nosepiece by holding the outside of the revolving disk– never push on the lens barrel
TRUE
The lens attached to the revolving nosepiece
Objectives
Used for initial location of the specimen
4x(scanning objective)
=used for initial location of the specimen
=for observing samples that don’t require higher magnification
10x(low-power objective)
=used for specimens requiring higher magnification.
40x(high-dry objective)
Why is high-dry objective called “dry”?
Because it doesn’t require oil unlike other high-power objective
Used for the magnification of microscopic specimens such as bacterial cells.
100x(high-oil objective)
How do you determine the total magnification?
It is determined by multiplying the power of the ocular by the power of objective in use.
Light rays from the lamp travel through a hole in the stage, through a specimen mounted on the slides, then through objective and ocular, to the eye
High-intensity lamp`
A lens that concentrates light may be found BETWEEN THE LAMP AND STAGE
Substage condenser
=If the light is too strong, you can adjust this.
=overlapping silvers of metal in a circular pattern resembling the iris of the human eye.
=You can change the amount of light passing to the specimen by rotating the lever projecting from the ________
Iris diaphragm
Entire upper assembly is HELD BAR
=connected to the base by a pivot
=It allows the top assembly to move into a more comfortable viewing position.
ARM
These knobs adjust the distance between the stage and objective.
Coarse adjustment and fine adjustment knobs
It changes the distance VERY LITTLE
Fine focus knob
changes the distance SIGNIFICANTLY
Coarse focus knob
