Microscope

Question 1

In the 17th century, the amateur Dutch scientist ____ used one of the first microscopes to discover a whole new world of living organisms

Answer 1

Anton van Leeuwenhoek

Question 2

Using a single lens, or ____ he observed tiny organisms in pond water and scrapings from his own teeth

Answer 2

Simple microscope

Question 3

Discovered that larger organisms had small microscopic subunits that he called boxes or cells

Answer 3

Robert Hooke

Question 4

The microscopes used in this course are ___ made of a set of lenses

Answer 4

Compound microscope

Question 5

Each lens closest to your eye is an ____. It magnifies an image by the factor indicated on the ocular’s barrel =, usually 10x

Answer 5

Ocular lens or eyepiece

Question 6

Holds the ocular in place

Answer 6

Body tube

Question 7

At the bottom of the body tube is the ___. A turret-like circular mechanism rotates so that different lenses can be selected.

Answer 7

Revolving nosepiece

Question 8

Each of the lens sets attached to the revolving nosepiece is an ____

Answer 8

Objective lens

Question 9

is used for initial location of the specimen

Answer 9

4x (Scanning objective)

Question 10

may also be used for initial location of the specimen. It is also used for observing specimens that do not need greater magnification

Answer 10

10x (Low-power objective)

Question 11

Is used for specimens requiring greater magnification. This objective lens is called dry lens because it does not require the use of oil

Answer 11

40x (High-dry objective)

Question 12

Is used for magnification of extremely small specimens, such as bacterial cells. It must be immersed in oil, so it is called the

Answer 12

100x (high-oil objective)

Question 13

Is determined by multiplying the power of the ocular lens by the power of the objective lens in use

Answer 13

Total magnification

Question 14

The specimen is usually mounted on a glass or plastic ___ that rests on stage

Answer 14

Microscopic slide

Question 15

If the stage has an adjustable bracket that moves the slide around mechanically, the stage is called ___, if not, the slide is held by ___ and must be moved by hands

Answer 15

Mechanical stage, stage clips

Question 16

Below the stage is a high-intensity ___. Light rays from the lamp travel through a hole in the stage, through the specimen mounted in a slide, and then through the objective and ocular to the eye

Answer 16

Lamp

Question 17

A ___ is a lens that concentrates lights, may be found between the lamp and the stage

Answer 17

Condenser

Question 18

Light intensity may also be adjusted by adjusting the ___

Answer 18

Diaphragm

Question 19

A ____ is a rotating disk with holes of different diameters.

Answer 19

Disk diaphragm

Question 20

An ____ is made of overlapping slivers of metal in a pattern resembling the iris flower, as does the iris of the human eye.
It can dilate or constrict its opening.

Answer 20

Iris diaphragm

Question 21

The entire upper assembly of the microscope is held in an upright position by a bar called the ___.

Answer 21

Arm

Question 22

The scope is supported by a square or horseshoe-shaped ___. The arm may be connected to the base by a ___, which allows the upper assembly to move into a more comfortable viewing position.

Answer 22

Base, pivot

Question 23

The ___ changes the distance very little

Answer 23

fine-focus knob

Question 24

the _____ changes the distance greatly.

Answer 24

coarse-focus knob

Question 25

Before you turn on the microscope, make sure that the light intensity dial is on the ____. If the light intensity dial is on a high setting, the sudden voltage surge may burn out the lamp.

Answer 25

lowest setting

Question 26

TRUE or FALSE

Adjust the coarse focus when using the high-power lens

Answer 26

False

Question 27

A ___ slide is a slide on which a wet specimen is placed, then covered with a coverslip.

Answer 27

wet-mount

Question 28

___ are used to make a specimen, or some of its parts, more visible.

Answer 28

Stains