Term In Relation With Light.

Q7. Give some important term in relation with light.
Ans. Some important terms in relation with light:

  • Medium: The substance through which light passes is called a medium.
    The Substance can be:

    • Transparent,
    • Translucent,
    • Opaque.
    • Transparent Substance: The substance which allows the light to pass through it is called transparent substance.
    • Translucent Substance: The substance which allows only a part of light falling on it to pass through is called translucent substance.
    • Opaque Substance: The substance which does not allow any light to pass through it is called Opaque substance
  • Source of light: An object which emits light is called source of light. All Luminous bodies are the source of light.
  • ┬áRay of light: A straight line indicating the path of light by using an arrow is called ray of light.
  • Or
  • A straight line path along which light travels in homogeneous medium is called ray of light.
  • Beam of light: A Bundle of light rays moving in the same direction emitted by a source of light is called it beam of light. It can be of three types:
    • Parallel beam of light: When the rays which constitutes the beam are parallel to one another, then it is called a parallel beam of light.
    • Convergent beam of light: When the light rays are actually meet or appears to meet at a point, then it is called a convergent beam of light.
    • Divergent beam of light: When the rays are actually diverged or appear to diverge from a point, then it is called divergent beam of light.

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