optical Flashcards
When light (radiation) shines on a material, it may be:
§ Reflected, absorbed and/or transmitted
Optical classification:
§ Transparent, translucent, opaque
Metals:
§ Fine succession of energy states causes absorption and reflection
Non-metals:
§ May have full no or partial absorption
§ Color is determined by light wavelengths that are transmitted or re-emitted
from electron transitions
§ Color may be changed by adding impurities which change the band gap
magnitude
Refraction
§ Speed of transmitted light varies among materials
phonon
units
single crystal
trsnp
dense polyc
transluscent
poros poly
opaque
metals
light absorbed
in metals light can be absorbed
nuclei or electron
amorphous polymers
transparent
semicrystalline polymers
opaque
transluscnce
light gp in and spread out
luminescense
reemission of light
