PRELIM QUIZ Flashcards
Inventor history of eyeglasses
(1216-1294)
Roger bacon
Salvino d’ Amarti (marco polo)
Greek
Chinese
Druids
Glass making
-it was a luxury and people could afford it.
-the first glass making manual from the Library of the ASSYRIAN KING “ASHURBANIPAL” (669-626 BC) DATES BACK AROUNG 650 BC
The discorvery of new technique
Around the end of the 1st century and was a revolutionary event in the history of glass making
Glass blowing
An amorphous substance made primarily of silica fused at high temperature with borates and phosphate
GLASS
Natural glass material
Obsidian
Fulgurite
Tektite
OPTICAL PROPERTIES
REFRACTIVE INDEX
ABBE VALUE
SPECIFIC GRAVITY
It is a ration of speed of light in a vacuum to its speed in a specific medium
REFRACTIVE INDEX
High refractive index
-thinner lens-more chromatic abbreviation -more reflection
-The degree to which a given lens material will dispense light
-chromatic abbreviation is inversely proportional to abbe value.
-ernst abbe
ABBE VALUE
It is a glass material made from lightning striking sand
FULGURITE
It is a glass material made from a METEORITIC impact on earth
Tektite
It is a glass material made from a METEORITIC impact on earth
Tektite
When a lens cannot bring all wavelength to a single point is called
Chromatic abbreviation
Abbe value named after
Ernst abbe
What is a refractive index of crown glass
1.523
