The Compound Microscope

Question 1

The smallest object that the eye can see at a distance of 250
mm is about ___.

Answer 1

0.07 – 0.14 mm

Question 2

microscope which uses light waves and lenses

microscope employs electron beams and magnetic fields to produce the image.

Answer 2

Light microscope

Electron type Microscope

Question 3

The two types of lenses in compound

Answer 3

Ocular

Objective

Question 4

> microscope field is brightly lighted and the object to be observed appears dark die to its ability to absorb

> object appears luminous against a dark background since it
reflects some of the incident light in all directions

Answer 4

bright field

Question 5

> allowing greater resolution and magnification. It is used principally to detect or even measure substances in specimens of living tissues

> makes use of the property of certain chemical substances that
release light at a different wavelength when exposed to UV rays. Such substances convert UV light into visible waves of greater length.

Answer 5

Ultraviolet (UV)

Fluorescent

Question 6

utilizes the refraction that occurs when light passes from
one medium into another of different density. The special objectives and condenser intensify slight differences in contrast produced by this bending of light. It is useful in studying the internal structures of microorganisms

Answer 6

Phase-contrast

Question 7

> keeps the microscope steady at any position of the stage.

> fastened to the base through the inclination joint, permits the adjustment of the stage to a desired angle.

Answer 7

base

arm

Question 8

reflects the light into the condenser.

Answer 8

Concave mirror

Question 9

concentrates the light rays received from the mirror and sends them to the objective.

Controls the amount of light

Answer 9

condenser

Iris diaphragm

Question 10

a horizontal platform upon which the specimen to be examined is placed. At the center of the stage is a circular aperture.

hold the slide in place on the stage.

Answer 10

stage

stage clips

Question 11

that part of the optical system of the microscope which produces the specimen’s initial magnified image (real) within the body tube.

The types of achromatic (corrected for spectral colors):

to which parfocal items are attached, allows convenient
shifting of the objectives.

Answer 11

objective

Dry Low Power

Dry High Power

Oil Immersion Objective

Revolving nosepiece

Question 12

Hollow cylindrical tube through which light passes from the objective to the eyepiece. Its upper portion is called the ___

part of the optical system through which the specimen is
viewed.

Answer 12

Body tube, draw tube

Eyepiece/ocular

Question 13

Used to bring the objective into approximate focus

Used for maximum definition

Answer 13

Coarse focus knob

Fine focus knob

Question 14

A glass disc with a mounted scale

A glass slide with graduations of known intervals

Answer 14

Ocular micrometer

Stage micrometer