lesson 4

Question 1

is an electrical control device. Light switches are used to on and off the illuminator.

Answer 1

LIGHT SWITCH

Question 2

The brightness adjustment system controls the voltage supplied to the light bulb, controlling the intensity (brightness) of the light bulb.

Answer 2

BRIGHTNESS ADJUSTMENT

Question 3

is a light source. In some compound microscopes, a mirror, which reflects the light from an external source to the sample, is used. In other optical microscopes, different electric bulbs of low voltages are used as a constant light source.

Answer 3

MICROSCOPIC ILLUMINATOR

Question 4

These are lenses that are used to collect and focus light from the illuminator into the specimen. They are found under the stage next to the diaphragm of the microscope. They play a major role in ensuring clear, sharp images are produced with a high magnification of 400X and above. The higher the magnification of the condenser, the clearer the image.

Answer 4

CONDENSER

Question 5

It’s also known as the iris. It is found under the stage of the microscope, and its primary role is to control the amount of light that reaches the specimen. It’s an adjustable apparatus, hence controlling the light intensity and the size of the beam of light that gets to the specimen

Answer 5

DIAPHRAGM

Question 6

an electrical control device. Light switches are used to on and off the illuminator

Answer 6

light switch

Question 7

This is the section in which the specimen is placed for viewing. They have stage clips that hold the specimen slides in place. The most common stage is the mechanical stage, which allows the control of the slides by moving the slides using the mechanical knobs on the stage instead of moving them manually.

Answer 7

STAGE

Question 8

This secures the specimen to the stage

Answer 8

STAGE CLIPS

Question 9

This is a hole in the microscope stage through which the transmitted light from the source reaches the stage

Answer 9

APERTURE

Question 10

A microscopic illuminator is a light source. In some compound microscopes, a mirror, which reflects the light from an external source to the sample, is used. In other optical microscopes, different electric bulbs of low voltages are used as a constant light source

Answer 10

MICROSCOPIC ILLUMINATOR

Question 11

The brightness adjustment system controls the voltage supplied to the light bulb, controlling the intensity (brightness) of the light bulb.

Answer 11

BRIGHTNESS ADJUSTMENT

Question 12

Adjustment Knobs are the control knobs used to focus the microscope on the specimen. These knobs are of two types;

A. Coarse Adjustment Knob

B. Fine Adjustment Knob

Answer 12

ADJUSTMENT KNOBS

Question 13

Coarse Adjustment Knob is used for focusing the image under low power magnification. It is a larger knob and is used to move the stage up or down very rapidly. The stage is raised or lowered rapidly with the help of a coarse adjustment knob.

Answer 13

COARSE ADJUSTMENT KNOBS

Question 14

Fine Adjustment Knob is used for fine adjustment. It is a smaller knob and is used to move the stage up or down very slowly. The stage covers a very small distance on each rotation of the fine adjustment knob. It is used to sharpen the image. It is mostly used while viewing under high power.

Answer 14

FINE ADJUSTMENT KNOBS

Question 15

A nose piece is a movable circular structure that houses all the objective lenses. It is also called the revolving turret. It is connected to the body tube and lies just above the stage. It can be rotated clockwise or counterclockwise to increase or decrease the magnification. The change in magnification results due to a change in the objective lens.

Answer 15

NOSE PIECE

Question 16

The objective lens is the lens that is closest to the specimen. They are fitted on the nosepiece. A standard microscope has 3 to 4 objective lenses of different magnifying powers: 4X, 10X, 40X, and 100X.. Objective lenses are color-coded and are of different sizes. Size and color depend on the power of the lens. The smallest lens is of the lowest power, and gradually, the longest will be of the highest power

Answer 16

OBJECTIVE LENSES

Question 17

LPO-Low Power Objective, gives the lowest magnification, usually 10x HPO - High Power Objective, gives higher magnification usually 40x or 43x 010-Oil Immersion Objective, gives the highest magnification, usually 97x or 100x, it is used wet with either cedar wood oil or synthetic oil.

Answer 17

LPO-Low Power Objective, gives the lowest magnification, usually 10x HPO - High Power Objective, gives higher magnification usually 40x or 43x 010-Oil Immersion Objective, gives the highest magnification, usually 97x or 100x, it is used wet with either cedar wood oil or synthetic oil.

Question 18

The eyepiece (ocular Lens) is closest to the viewer’s eye. They are located at the top of the microscope. This part is used to look at the specimen. These lenses come in different magnification powers from 5X to 30X, but the most common ocular lenses are of 10X or 15X magnification. They magnify the image for the second time.

Answer 18

EYE PIECE

Question 19

It’s the eyepiece holder. It carries the eyepiece just above the objective lens. In some microscopes, such as the binoculars, the eyepiece tube is flexible and can be rotated for maximum visualization for variance in distance. For monocular microscopes, they are none flexible.

Answer 19

EYE PIECE TUBE

Question 20

Diopter Adjustment is a control knob present only in the binocular microscope that is used to change focus on one eyepiece. It is used to correct any difference in vision and compensate for the differences in vision between the viewer’s two eyes

Answer 20

DIOPTER ADJUSTMENT

Question 21

The head is a cylindrical metallic tube that holds the eyepiece lens at one end and connects to the nose piece at other end. It is also called a body tube or eyepiece tube.

Answer 21

head

Question 22

This is the part connecting the base to the head and the eyepiece tube to the base of the microscope. It supports the head of the microscope and is also used when carrying the microscope. Some high-quality microscopes have an articulated arm with more than one joint, allowing more movement of the microscopic head for better viewing.

Answer 22

arm

Question 23

The base is the lowermost part of the microscope that supports the entire microscope structure. It provides stability for the microscope. Illuminators, light switches, and electrical wiring systems are fitted in the base.

Answer 23

base