1: Light Flashcards
Incandescent light source
Material emitting light when heated to a high temp (light bulb, wood)
Luminescent light source
Material emitting light by producing energy from a chemical reaction releasing little heat (fireflies, fish)
Fluorescent
Material emitting light by absoring high energy radiation (noble gasses: quantum energy)
Phosphorescent
Material absorbs and stores energy radiation to continue emitting when radiation removed (glow sticks)
Triboluminescence
Energy released from crushed/broken sugar crystals
Laser acronym
Light Amplification by Stimulated Energy Radiation
How do lasers work
Produce beams of photons all with same energy travelling in phase, producing fine and intense beams of light
3 ways light can propogate in media
Transparent (light goes through)
Translucent (diffused in many directions)
Opaque (light blocked)
How can media affect light’s passage
Reflect
Refract
Absorb
Light phenomena: reflection
Bounces off shiny material (mirror)
Light phenomena: refraction
Bends when change in media (air to water)
Light phenomena: dispersion
Splits into colours when passing through a prism (rainbow, oil)
Light phenomena: absorption
Light absorbed by object (black clothes)
Light phenomena: diffusion
Light spreads in many directions from a source (light bulb)
Light phenomena: diffraction
Light bends through small openings giving non uniform image