PUMPA - SMART LEARNING

எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

Book Free Demo
  1. Take a convex lens or magnifying glass.
  2. Put it in the path of sunrays.
  3. Place a sheet of paper.
  4. Adjust the distance between the lens and the paper till you get a bright spot on the paper.
  5. Hold the lens and the paper in this position for a few minutes.
Does the paper begin to burn?
 
due to the light rays of the Sun.
 
Now replace the convex lens with a concave lens. Do you see a bright spot on the paper this time, too? Why are you not getting a bright spot this time?
 
, a bright spot in a manner is formed on the sheet due to  nature of the lens.