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Description
Refractive Index to five decimal places
Abbe Number
Constants of Dispersion formula n
2
= A
0
+ A
1
λ
2
+ A
2
λ
-2
+ A
3
λ
-4
+ A
4
λ
Relative Partial Dispersions
Melting Frequency
Production Method
Price
Symbol n t
, n s
,…….n
i
V d
, V e
, n f
-n c
, n f
-n c’
A
A
0
1
, A
0pow
,….. A
(∆n/∆T)rel.
(∆n/∆T)abs.
B d
λ80/λ5
T
MA, A, B, C
DP, RP
Numeric
,
5pow
P
A’,t
,
P r,A’
,…P’
I,h
Deviation of Relative Partial Dispersions
∆P from the "Normal Line"
Chemical properties
∆P x,y
DW, DA, T blue
D
NaOH
, D
STPP
,
D
0
Thermal Properties
Mechanical Properties
Electrical Properties
-6
+ A
5
λ
-8
Temperature Coefficients of Refractive
Index (10-6/K at 632.8nm)
Stress Optical Coefficient
Specific Gravity
Bubbles and Inclusion
Color
Internal Transmittance λ (nm)
Meaning
Index at individual wavelengths from 1014nm to 365.01nm
Measure of dispersion for different frequency ranges.
Coefficients for a polynomial that will allow you to calculate refractive index at a given wavelength to +/- 5x 10-6 nm over a range of 365nm to 1,014nm
The relative partial dispersion P x,y and the alternate relative partial dispersion P’ x,y are defined by the following equation:
P x,y
=(n x
-n y
)/(n
F
-n c
) and P’ x,y
=(n x
-n y
)/(n F’ -n c’ ). X and Y are the standard spectal lina assignments. When plotted against
Abbe number to compare glasses.
Values referenced to a straight line defined by the Px,Y values found for the glass types C7 and F2
DW: is dimming: Clouding of glass due to humidity causing white spots.
DA: Acid durability
T blue
: Adjustment to DA test due to inaccuracy in test modeling ION exchange process.
D
NaOH
: Latent scratch resistivity Hydroxyl ion
D
STPP
: Latent Scratch resistivity to polymerized phosphoric ions
D
0
: intrinsic chemical durability
Tg: Transformation temperature. Glass to liquid transition temperature.
Ts: Sag Temperature point where thermal expansion stops increasing and starts decreasing.
T
10 x : Temperature required to relieve internal stress after a given time, anneal or soften.

: Coefficient of Linear Thermal Expansion

: Thermal conductivity
C
P
: Specific heat
H k
: Knoop Hardness, resistance to surface penetration
FA: Abrasion Factor, measure for lapping
E: Young’s Modulus of elasticity
G: Shear Modulus
 : Poisson’s Ratio
 b :Flexural Strength (Modulus of Rupture)
C o
: Capacitance
 v
: Volume resistivity at 20 and 200 C.
Used to adjust refractive index due to temperature changes.
Ratio of density of glass to water
Total cross sectional area of bubbles mm^2 in 100ml of glass
L Signifies special glass that have less coloration
Measure of transmittance at different thickness and wavelengths
MA highest, A Higher, B Low, C Very Low
Direct vs reheat press
Relative Price comparison

Name of rule
The rule of Thumb
When it is Used
Limitation
Name of rule
The rule of Thumb
When it is Used
Limitation
Name of rule
The rule of Thumb
When it is Used
Limitation
Index of Refraction
Index is never less than 1
Always
Does not apply to some new Metamaterials
Color of light
Color of light is determined by the
EM wave’s frequency.
Always when describing aspects of systems that are affected by the color of EM waves.
None , Optics often used wavelength but it is not a constant when n changes along the path
Geometric optics
Can ignore wave property of light treat as particle (i.e. ray trace)
λ << feature size
When high accuracy is required