OPTICAL MINERALOGY AND PETROGRAPHY (POLARIZING MICROSCOPE)

Question 1

Concentrates Light

Answer 1

Collector lens system

Question 2

CONTROLS light ray bundle at the source field

Answer 2

FIELD IRIS Diaphragm w/ring

Question 3

Filter w/c approximates Daylight

Answer 3

Filter mount w/ blue filter

Question 4

Polarizes light in one direction

Answer 4

Polarizer (Lower Polar)

Question 5

controls and illuminates light coming from the source field directed to the object field or simply controls light focus

Answer 5

Condenser

Question 6

Controls CONE OF LIGHT and its INTENSITY catering to the objective. Slightly closed for Becke Line test

Answer 6

Aperture Iris Diaphragm

Question 7

The platform where samples or thin sections are being placed

Answer 7

Stage

Question 8

Helps fix the specimen on stage so that it will not move while conducting observations

Answer 8

Stage Clips

Question 9

Use for point location and systematic traverse in a species along mutually perpendicular directions

Answer 9

Mechanical Stage w/ Vernier Scale

Question 10

Used to bring the specimen into sharp focus under LOW POWER and is used for all focusing when using high power

Answer 10

Fine Adjustment Knob

Question 11

Used the move the stage up and down to decrease and increase working distance

Answer 11

Coarse Adjustment Knob

Question 12

Holds the objective lenses

Answer 12

Revolving Nosepiece

Question 13

Essential lenses of Microscope for magnification and Resolution enhancement

Answer 13

Objetive Lens (Objectives)

Question 14

For insertion of microscopic accessory plate

Answer 14

Test plate

Question 15

Located usually above the objective lens and used to polarize light perpendicular to the polarization of the lower polarizer

Answer 15

Analyzer (Upper Polarizer)

Question 16

A small lens below the ocular used to view interference figure

Answer 16

Amici-Bertrand Lens

Question 17

Essential lenses of micrisicope for magnification or resoltuon of images coming from the objectives

Answer 17

Eyepiece/s

Question 18

Used to focus eye pieeces

Answer 18

Diopter Adjustment Ring

Question 19

An accessory plate aka as one wavelength or first order red plate whch gives 1st order red interference color with crossed polar with its permitted electric vectors at 45 deg to those of the polarizer and analyzer and is used to dertermine fast and slow directions by increasing and decreasing retardation

Answer 19

Gypsum Plate (Lambda Plate) (550nm)

Question 20

An accessory plate used to determine BIREFINGENCE and OPTIC SIGN that produce interfernce colors from the beginning of the First to the end of the Third or Fourth order. (0.009)

Answer 20

Quartz Wedge

Question 21

Cut to such thickness that increases or decreases retardation of a section by about 1/4wavelength (Sodium light)

Answer 21

Mica Plate (1/4lambda plate)

Question 22

Beam of Light consists of STREAM OF MINUTE PARTICLES or PHOTONS set at high velocity by a luminous body that travel thru space in STRAIGHT LINES

Answer 22

Corpuscular Theory

Question 23

Considered light to be transmitted by VIBRATION of PARTICLES IN THE WAVES and may be used to readily explain reflection refraction, diffraction and interference

Answer 23

Wave Theory

Question 24

Who is the proponent of Wave Theory

Answer 24

Christian Huygens

Question 25

Porposed that light is made up of waves but not of vibrating particles but of EM which are fields normal to each other and normal to the direction and propagation of light

Answer 25

Electromagnetic Theory

Question 26

Who is the proponent of the EM theory

Answer 26

James Maxwell

Question 27

Assumes that light are quanta which is radiated discontinuously by a black body

Answer 27

Quantum Theory (Plank)

Question 28

Observation of Realitistic virtual image with a flat field

Answer 28

Orthoscopic Observation

Question 29

Observation that yields interference figure w/c represent an optical pattern caused by behaviour of light in individual crystals

Answer 29

Conoscopic Observation

Question 30

Setup when light hitting the thin sectio is polarized to the NS vibration direction and light vibrates only in one direction

Answer 30

PPL

Question 31

Steup when another polarized is inserted in the E-W vibration direction and crosses the earlier N-S polarized light

Answer 31

Cross Polarized Light (XPL)

Question 32

Light is strongly converged to produce a interference figure

Answer 32

Conoscopic Observation

Question 33

Set up for PPL

Answer 33

Bertrand Out
Analyzer Out
Condenser top lens out -
Polarizer In
Light Source On

Question 34

Set up for XPL

Answer 34

PPL + Analyzer in

Question 35

Set up for Conoscopic

Answer 35

PPL + Condenser Top Lens IN + Bertrand Lens

Question 36

Centering the Stage with the Field

Answer 36

Centered when axis of rotation coincides with the tube axis, the tube axis standing perpendicular to the center of the field of view

Question 37

How mant optic class is possible?

Answer 37

5

Question 38

Dichroic Minerals

Answer 38

Uniaxial

Question 39

Trichroic Mienrals

Answer 39

Biaxial