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How do you find the focal length of a concave mirror by shortcut method ​

Answer»

Answer:

  1. FACE the CONCAVE mirror to the sun
  2. now adjust a piece of PAPER Infront of the mirror
  3. move the paper till you GET a bright intense spot if the sun
  4. this is the focal point of the mirror
  5. now measure the distance
  6. this is the focal length of the concave mirror



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