Light Flashcards
Incandescent
Emits light when current passes through a filament
Fluorescent
Ultraviolet light emitted from plasma excites phosphors to produce light
LED
Light-emitting Diode
A small bulb containing a semiconductor that emits light when current is passed through it
Transparent
Allows light to pass
Translucent
Allows some light to pass and blocks other light
Opaque
Blocks all light
Umbra
Center of shadow, no light shining
Penumbra
Gray area around umbra, small amount of light shining
Prism
Glass that splits the colors of light
Retina
Back part of the eye
Rods
Special cells in the eye that detect light
Cones
Special cells in the eye that detect different colors
Reflection
Waves changing direction when it bounces off a surface that does not absorb it
Angle of incidence
Angles at which light approaches an object
Angle of Reflection
Angle at which light reflects off of an object
Plane mirror
Flat Mirror
Virtual Image
Reflected image
Concave Mirror
Surface is curved away from the imcoming light
Convex Mirror
Surface is curved toward the incoming light
Refraction
Bending of light
Mirage
Image of the sky projected above the ground because of different densities of air
Concave Lens
Surfaces curve toward center of the lens
Convex Lens or Diverging Lens
Surfaces curve outward away form the center of the lens
Focal Point or Principal Focus
Point at which light rays converge
Focal Length
Distance from lens to focal point
