Difference between luminous and non-luminous object

• Luminous objects- these are object that emit or send off their own light .They tend to radiate heat as an effect of being luminous and can store energy.

  for example:

  • sun
  • stars
  • light bulbes
  • lamps
  • laser
  • campfires
• Non-luminous objects- objects that do not emit light.

  example:

  • moon
  • cars
  • buildings etc.(most of the things that we see)
• Light can be produced through incandescence and luminescent.
• Incandescent- when an object is at very high temperature it starts to glow and become dull red in color.
• Luminescent- process which light is produced other than by heating.
• 2 forms of luminescene:

  • fluorescence
  • Phosporescene
• Fluorescent- refers to the release of light that last no more than about 10 nanoseconds after it begins.
• Phosphorescent- refers to the release of light that last longer than 10 seconds.
• Light and Transparency

  • Transparent
  • Opaque
  • Translucent
• Transparent- A material that allows light to pass through it, but not other forms of radiation.
• Opaque- no light can pass through it, it is completely black.
• Translucent- A substance that transmits light but does not absorb it.