Chapter 3

Question 1

the widest bottom part that supports the microscope

Answer 1

base

Question 2

The straight or curved vertical part that connects the base to the head

Answer 2

arm

Question 3

the part that extends from the arm and contains the ocular lens and the rotating nosepiece with the objective lenses.

Answer 3

head

Question 4

one or two removable lenses that you look through to observe the microscope slide. Typically these lenses have a magnification of 10x.

Answer 4

Ocular lenses

Question 5

A line in the ocular lens used to identify a specific area on the slide.

Answer 5

pointer

Question 6

three or four rotating lenses on the nosepiece used for varying magnification.

Answer 6

objective lenses

Question 7

as the barrel of the objective lens increases in length the magnifying power _______ but the field of view _______.

Answer 7

increases / decreases

Question 8

the objective lenses are mounted on the ________.

Answer 8

nosepiece

Question 9

the flat platform located beneath the objective lenses on which the microscope slide is placed.

Answer 9

stage

Question 10

These hold the slide securely in place for viewing and can be moved with precision by using the adjustor knobs.

Answer 10

mechanical stage or spring clips

Question 11

what are the large knob or dial and the small knob in the middle of the large knob, that can be used to move the stage up or down called and what is their purpose.

Answer 11

the large is the coarse knob used for course focusing and the small knob is the fine knob used for precision focusing.

Question 12

what is the name of the lens located below the stage that allows more or less light through the specimen on the slide?

Answer 12

condenser

Question 13

what is the name of the knob that raises and lowers the condenser?

Answer 13

adjustment knob

Question 14

What is the name of the part under the condenser that changes the aperture diameter and regulates the amount of light that passes through the condenser?

Answer 14

iris diaphragm

Question 15

The source usually built into the base that allows you to see what is on the slide and that has a dial to control its intensity.

Answer 15

substage light

Question 16

what kind of paper is safe to use to clean the lenses on the microscope?

Answer 16

special lens paper only

Question 17

how many hands should you use to carry the microscope?

Answer 17

two

Question 18

what is the lighted circular area you see as you look through the oculars?

Answer 18

the field of view

Question 19

most microscopes are _____ which means when you move to a different magnification the specimen stays almost focused allowing you to only have to fine focus.

Answer 19

parfocal

Question 20

which focusing knob should be used when using the high dry lens?

Answer 20

fine focusing knob

Question 21

which lens should be in position when you put the microscope away?

Answer 21

the scanning objective lens

Question 22

what should you do with the iris diaphragm to obtain maximum contrast?

Answer 22

you should decrease the aperture size

Question 23

what position should the condenser be in to to focus the most light on the specimen?

Answer 23

the highest position to focus the most light.

Question 24

does the size of the field of view increase or decrease when going from a low to a higher power objective lens>

Answer 24

it decreases

Question 25

how do you calculate the magnification of the various lenses?

Answer 25

you multiply the ocular lens (usually 10x) by the power of the objective lens. example objective lens with a power of 60x multiplied by 10x = 600x