Luminous Objects


Definition of Luminous objects

Objects which emit light on their own are known as luminous objects."

More About Luminous Objects:

 


  • Luminous objects are responsible for our vision.
  • In complete darkness we cannot see/distinguish the different objects around us.
  • Human eye perceives the light reflecting from different objects to cause the sensation of vision.
  • In order to reflect (bounce back, come back) from different objects, we must make the light to fall on the objects.
  • Light is generated/emitted/produced/comes from only luminous objects. Thus luminous objects are responsible for our vision.
    1. Example - Example: Lighted candle, torch bulb, the sun and stars.
  • In order to emit light, the object must have its own source of energy. A torch shines because of the chemical energy stored in its batteries, whereas all stars shine using energy created by nuclear fusion
  • Sun also emits light as a result of fusion of Hydrogen atoms. Hence they are considered as Luminous objects.



Worked Example:


Which of the given objects is a luminous object?

    A. Moon
    B. Gold
    C. Earth
    D. Candle.
    Correct answer is D

Solution:



    Step 1: Moon reflects the sun light hence it is Non-luminous object.
    Step 2: Metals only reflect the light which falls on them.
    Step 3: Earth will not produce light.
    Step 4: Candle burns and emits light on its own, hence candle is the luminous object.

    Related terms: Uniform acceleration | Deceleration (or) Retardation
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