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Summary

Light is an invisible energy which causes the sensation of vision in us. 
  • Formation of shadows suggests that light travels in straight lines. 
  • Light traveling through the medium falls on an object, a part of the light bounces off from the object. This process is called reflection of light. 
  • If a parallel beam of light is reflected as a parallel beam, when it strikes on a smooth and polished surface, then it is called regular reflection. 
  • If a parallel beam of light is reflected as in different directions, when it strikes on a rough surface, then it is called irregular reflection. 
  • The number of images, when two plane mirrors are inclined at an angle θ is
  • The braille system is a method that is widely used by blind and visually impaired people for reading and writing.




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