Light And Lasers Flashcards
Radiation
Emission or propagation of light
Unaided eye
Naked eye - without any kind of object
Frequency
Nb of occurence of a repeating event per second
Wavelenght
Distance between 2 corresponding points of a repeating signal
Visible light
Portion of the electromagnetic spectrum visible to the human eye
Application of lasers
Medicine : surgery -> myopia and hypermyopia
Measurement : long distances
Industry
Cutting pieces : precise and powerful
Speed
Displacement per unit of time : scalar quantity
Velocity
Displacement in a given direction : vector
Treble
High
Bass
Low
Types of waves
Electromagnetic : light
Mechanical : sound
Translucent
Light can pass through but impossible to identify objects
Types of waves
Transverse vs longitudinal
Relation between frequency and wavelenght
f = c/lambda
LASER
Light Amplification by Stimulated Emission of Radiation
Laser =
Device that emits light coherently, temporally and spacially
Coherent
All the rays are in phase
Unidirectional
Propagates only in 1 direction as a tight beam of light
Monochromatic
Only 1 color = 1 frequency
Dispositif experimental
Experimental set up
________
O |________
TO the left
_________
| ●
|_________
ON the left
