Explain the proper technique for transporting the microscope.
The microscope should be stored with the _______ lens in position over the stage.
Carries the objective lens; rotates so that the different objective lenses can be brought into position over the specimen
Assume there is an object on the left side of the field that you want to bring to the center (that is, toward the apparent right). In what direction would you move your slide?
If a microscope has a 10x ocular and the total magnification at a particular time is 950x, the objective lens in use at the time is _______x.
Why should the light be dimmed when looking at living (nearly transparent) cells?
If, after focusing in low power, only the fine adjustment need be used to focus the specimen at the higher powers, the microscope is said to be _______.
Is, when using a 10x ocular and a 15x objective, the field size is 1.5mm, the approximate field size with a 30x objective is ____ mm.
If the size of the high-power field is 1.2mm, an object occupies approximately third of that field has an estimated diameter of ____ mm.
You have been asked to prepare a slide with the letter k on it. Draw the k as seen in the low-power field.
Say you are observing an object in the low-power field. When you
switch to high power, it is no longer in your field of view.
Why might this occur?
What should be done initially to prevent this from happening?
Increase or decrease as one moves to higher magnifications with the
2. Working distance
3. Amount of light needed
4. Depth of field
A student has the high-dry lens in position and appears to be intently observing the specimen. The instructor, noting a working distance of about 1 cm, knows the student isn't actually seeing the specimen. How so?
Describe the proper procedure for preparing a wet mount.
Place the specimen on the slide with a medicine dropper or place a drop of water or saline on the slide. Mix specimen into drop using a toothpick. If staining, add a drop of stain and mix with a toothpick. Hold a coverslip with forceps so that the coverslip touches one side of the specimen drop, and then slowly and carefully lower the angled coverslip onto the specimen.
Indicate the probable cause of the following situations arising
during use of a microscope.
A. Only half of the field is illuminated
B. Field does not change as mechanical stage is moved