Chp 20 - Basic Principles of Light Flashcards
1
Q
Electromagnetic energy is measured using what?
A
wavelength or Frequency
2
Q
when wavelength increase frequency?
A
decrease
3
Q
when wavelength decrease frequency?
A
increase
4
Q
what is the speed of light in a vacuum
A
300,000 km/s
5
Q
LED light sources typical wavelengths are?
A
850 nm and 1300 nm
6
Q
LASER light sources typically are?
A
1310 nm and 1550 nm
7
Q
Define Refraction?
A
change of direction of light as it changes speed passing from one material to another. (Snell’s Law)
8
Q
What does Total Internal Reflection
A
Makes optical communications possible
9
Q
Fresnel Reflection occurs when?
A
light changes speed as it passes from a material with one IR to another material with a different IR, Occurs at connectors in fiber optics
