Microscopes Flashcards
When was the first microscope developed?
final years of 16th century
Where was the first microscope developed?
England
How was the first microscope discovered?
by accidentally inverting a telescope
Who discovered that a combination of two lenses (ocular and objective) enlarges an object that could be seen?
Zaccharias Jansen and his son Han
When was the compound microscope modified and by who?
17th century; Robert Hooke
Who realized that lenses with very short focal lengths were the key to more magnification?
Robert Hooke and Anthony van Leeuwenhoek
Who discovered animalcules, or bacteria?
van Leeuwenhoek
What do you use when making a microscopic drawing?
pencil
Where do you label in a drawing?
Outside the FOV
How do you determine the total magnification?
multiply the power of the objective times ten
total magnification on low power
40x
total magnification on medium power
100x
total magnification on high power
430x
Largest field of view
low power
Smallest field of view
high power
When looking at something through a microscope, it will appear upside down.
True
When looking at something through a microscope, it will appear reversed.
True
Why does something appear upside down and backwards?
because of two sets of mirrors in the microscope
When moving something under the microscope to the right, it will appear to move to the . . .
left
What is magnification?
Magnification is the image getting bigger.
What is resolution?
Resolution is how clear the image is.
What is a simple microscope?
microscope with one lens
What is a compound microscope?
microscope with two sets of lenses
What is an example of a compound microscope?
our microscopes
What is an example of a simple microscope?
magnifying glass
If the lens is dirty, how do you clean it?
lens paper
How do you properly put away a microscope?
Turn the objective lens to low, turn the light off, wrap the cord around the arm, and put cover on
I should use the coarse adjustment on high power.
false
Name the steps for making a wet mount.
- Place the specimen on the glass slide.
- Pour 2-3 drops of water on the specimen.
- Place a cover slide over the water, holding it perpendicular to the slide, then gently dropping it.
What four colors are used in printers?
cyan, magenta, yellow, black
What is a concave lens?
lens that curves inward
What is a convex lens?
lens that curves outward
