Optical Microscope

Question 1

Used extensively to examine transparent minerals, fragments, grains and small crystals, as well as thin sections of minerals, rocks and other crystalline aggregates

Answer 1

Polarizing Microscope

Question 2

useful in the determination of the optical properties of individual crystals or aggregates and in the interpretations of textures, structures, growth patterns, and various relationship of natural or artificial substance.

Answer 2

Polarizing Microscope

Question 3

source of light of the microscope

Answer 3

Light source

Question 4

Concentrates light

Answer 4

Collector lens system

Question 5

controls light ray bundle at
the source field

Answer 5

Field iris diaphragm with
field iris diaphragm ring

Question 6

used to polarize the light in one direction

Answer 6

Polarizer

Question 7

It controls and illuminates light coming from the source field directed to the object field.

Answer 7

Condenser

Question 8

controls cone of light catering the objective

Answer 8

Aperture Iris Diaphragm

Question 9

It is useful for R. I. determination

Answer 9

Aperture Iris Diaphragm

Question 10

platform for specimen

Answer 10

Stage

Question 11

Fix specimen on stage

Answer 11

Stage Clips

Question 12

Used for point locations and systematic traverse in a species along mutually perpendicular directions

Answer 12

Mechanical Stage

Question 13

For Focusing Image (moving in cm)

Answer 13

Coarse Adjustment Knob

Question 14

For Focusing Image (moving in mm)

Answer 14

Fine Adjustment Knob

Question 15

holds objectives

Answer 15

Revolving Nosepiece

Question 16

Essential lenses of microscope for magnification and resolution

Answer 16

Objectives initial

Question 17

Magnifications of the Objectives initial

Answer 17

4x, 10x, 20x, 40x

Question 18

used to **determine fast and slow directions (electric vectors) of light polarization **in crystals under view on the microscope stage by increasing or decreasing retardation of the light

Answer 18

Gypsum plate

Question 19

cut to such thickness that it increases or decreases
retardation of a section by about 1/4λ (sodium light)

Answer 19

mica plate

Question 20

ground to produce interference colors from the
beginning of the first to the end of the third or fourth order.

Answer 20

quartz wedge

Question 21

quartz wedge equals to?

Answer 21

0.009

Question 22

Beam of** light consists of a stream of minute particles, or photons,** given off at high velocity by a luminous body that travel through space in straight lines and eventually reach the eye.

Answer 22

Corpuscular Theory

Question 23

light to be transmitted by the vibration of particle in the waves

Answer 23

Wave Theory

Question 24

Magnifications of the Objectives initial

Answer 24

4x, 10x,20x, 40x

Question 25

The phenomena of light such as reflection, refraction, diffraction and interference may be readily explained in accordance with this theory

Answer 25

Wave Theory

Question 26

The (Dutch) scientist that advanced the Wave Theory

Answer 26

Christian Huygens

Question 27

considers light as made up of waves but said that waves are electromagnetic

Answer 27

Electromagnetic Theory

Question 28

He proposed the Electromagnetic Theory in 1873

Answer 28

James Clerk Maxwell

Question 29

Assuming that radiating oscillators in a black body radiate energy discontinuously in units called quanta.

Answer 29

Quantum Theory

Question 30

He proposed the Quantum Theory

Answer 30

Planck / Max Planck

Question 31

The **locus of all the points** of a medium which receives light wave disturbance simultaneously so that all points are in the same phase.

Answer 31

Wave Front

Question 32

A **perpendicular** drawn to the surface of a wave front at any direction of propagation of light

Answer 32

Wave Normal

Question 33

Direction in which the light is propagated

Answer 33

Ray of Light

Question 34

It is alway perpendicular to wave front

Answer 34

Ray of Light

Question 35

A wave normal represents a _________________

Answer 35

Ray of Light

Question 36

The wave normal and direction of propagation of light rays are** perpendicular to the wave front.**

Answer 36

Isotropic

Question 37

The light rays are** not parallel to the wave front.**

Answer 37

Anisotropic

Question 38

May represent a curve combining movement around a circle with motion along a straight line.

Answer 38

Displacement

Question 39

Lies in the wavefront and is perpendicular to the ray in isotropic media.

Answer 39

Vibration direction

Question 40

In ____________, Vibration direction is only perpendicular in limited directions.

Answer 40

anisotropic media

Question 41

Distance between two successive crests or troughs, or any corresponding distance along the wave.

Answer 41

Wavelength

Question 42

Surface determined at a given instant by all parts of a system of waves traveling along the same direction and in the same phase.

Answer 42

Wavefront

Question 43

wavefront is perpendicular only in certain directions in?

Answer 43

anisotropic

Question 44

Part of the microscope that we move left to right. | based on discussion

Answer 44

Mechanical Stage

Question 45

the amount of space between the front of the objective and the top of the coverglass, when the specimen is in focus | definition is from google but it was discussed

Answer 45

Free working distance

Question 46

for insertion of microscopic accessory plate

Answer 46

Test plate

Question 47

polarizes light

Answer 47

Analyzer

Question 48

for observing interference figure

Answer 48

Bertrand lens

Question 49

Approximates daylight ## Footnote note that they only use blue filter before bc the light is yellow

Answer 49

Filter mount with blue filter

Question 50

Holds the eye piece

Answer 50

Observation tube

Question 51

essential lenses of microscope for magnification or resolution conform with objectives

Answer 51

Eyepieces with cross hair

Question 52

for focusing eyepieces

Answer 52

Diopter adjustment ring

Question 53

for camera attachment in photomicrography

Answer 53

Photo Tube

Question 54

number of vibrations in a given unit of time.

Answer 54

Frequency

Question 55

maximum displacement of a wave from the line of transmission

Answer 55

Amplitude

Question 56

time interval necessary for a wave to undergo a complete oscillation

Answer 56

Period

Question 57

point of the wave with the maximum upward displacement

Answer 57

Crest

Question 58

point of the wave with the greatest downward displacement

Answer 58

Trough

Question 59

a group of light waves following along a sample path

Answer 59

Beam

Question 60

straight-line path followed by light in moving from one point to another

Answer 60

Ray

Question 61

equal to the ratio of the wave-normal velocity in a vacuum to the wave-normal velocity in the medium whether isotropic or anisotrophic

Answer 61

Refractive index

Question 62

light of a single wavelength

Answer 62

Monochromatic light

Question 63

lies parallel to the plane of the wavefront.

Answer 63

Light vector

Question 64

In ____________ , Light Vector is perpendicular to the direction of the propagation

Answer 64

isotropic

Question 65

In ______________ , Light vector is still parallel but not perpendicular to the direction of the propagation.

Answer 65

anisotropic

Question 66

2 Types of Vector

Answer 66

1. electric 2. magnetic

Question 67

measures the electrical displacement

Answer 67

electric

Question 68

measures the magnetic displacement or induction.

Answer 68

magnetic

Question 69

combination of all the different wavelengths visible to the eye

Answer 69

White light

Question 70

Speed of light

Answer 70

186,284 miles per second

Question 71

realistic virtual image with a flat field

Answer 71

Orthoscopic observation

Question 72

elds interference figures which represent an optical pattern caused by the behavior of light in individual crystal

Answer 72

Conoscopic observation