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Physics- Light

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  • 1. Light is a form of energy which enables us to see objects from which it comes (or from which it is reflected). It is of two types : Luminous; Non-luminous.
  • 2. There are two theories about the nature of the light : Particle theory – Light is composed of particles which travel in a straight line at very high speed . Wave theory – Light consists of electromagnetic waves which do not require a material medium (solid liquid or gas) for their propagation.
  • 3. The process of sending back the light rays which falls on the surface of an object , is called reflection of light. Most of the objects reflect light which falls on them . Some objects reflect more light whereas some objects reflect less light . The objects having shiny or polished surfaces reflect more light . REFLECTION
  • 4. There are two laws for reflection: The incident ray, the normal and the reflected ray ,all, lie in the same plane; The angle of incidence is equal to angle of reflection.
  • 5. When an object is placed in front of a plane mirror , then the right side of the object appears to become the left side of the image ; and the left side of object appears to become the right side of the image. This change of sides of an object is called lateral inversion.