Microscope

Question 1

heavy U- or V-shaped foot on which the microscope stands.

Answer 1

Base

Question 2

a firm support arising from the base.

Answer 2

Pillar

Question 3

platform with central aperture and clips to hold the slide being studied.

Answer 3

stage

Question 4

a stout curved handle used in carrying the instrument.

Answer 4

arm

Question 5

inner rotary knob attached within the arm. It is for more delicate focusing especially at high
magnification.

Answer 5

Fine adjustment knob

Question 6

box-like structure attached to the arm and bears the lenses and prism.

Answer 6

Body tube

Question 6

bears the four objective lenses

Answer 6

Rotating (revolving) nosepiece

Question 7

metallic structure above the nosepiece that protects the objectives.

Answer 7

Dust shield

Question 8

outer rotary knob that quickly moves objectives to focus or obtain an image of the object.

Answer 8

Coarse adjustment knob

Question 9

found on top of the body tube into which ocular (eyepiece) is inserted; can be rotated 360⁰ for ease of
viewing.

Answer 9

Draw tube

Question 10

found below the stage; serves to gather and direct the light to illuminate the object. The concave mirror will gather more light than the flat (plain) mirror, but the latter provides more satisfactory lighting at high magnifications.

Answer 10

Mirror

Question 11

a metal plate with circular openings with different diameters that control the amount of light reaching
the object.

Answer 11

Iris diaphragm

Question 12

found between the mirror and the stage and serves to further concentrate light rays on the
specimen.

Answer 12

Condenser (lens system)

Question 13

consist of two or more lenses fixed in a rigid mount that serve to form a real image of the
object within the body tube.

Answer 13

Objectives of object lens

Question 14

smallest and shortest, with lowest magnification but allows viewer to see a greater area.

Answer 14

Scanner

Question 15

shorter lens with a magnifying power of 10x.

Answer 15

Low power objective (LPO)

Question 16

the longer lens that magnifies 40x and forms a bigger image of the object.

Answer 16

High power objective (HPO)

Question 17

the longest objective, with a magnifying power of 100x, used only with immersion oil.

Answer 17

Oil immersion objective (OIO)

Question 17

These consist of special types of glass, carefully ground and polished, and aligned on an optical axis.

Answer 17

Optical Parts

Question 17

two larger lenses at the top of the draw tube that serve to further magnify the image. The lens of
the ocular refracts (bends) the light rays passing from the real image to the retina of the eye in such a way as to produce
the effect of a still virtual image (ghost image). The latter is imaginary (it cannot be projected on a surface); it produces on
the eye the same effect as if an object and the size of the virtual image were held at ordinary reading distance.

Answer 17

Ocular or eyepiece

Question 18

A compound microscope consists of certain precise mechanical parts (chiefly of metal) to support and facilitate the use of
the optical parts (of glass) that provide the magnified image.

Answer 18

STRUCTURE

Question 19

Is a coordinate system of lenses arranged to produce an enlarged, focusable image of a specimen.

Answer 19

Light microscope