A laser signal is sent towards the moon with a speed of light C and returns after a time f seconds. The distance of the moon from the observer is

Q. A laser signal is sent towards the moon with a speed of light C and returns after a time f seconds. The distance of the moon from the observer is

  1. ct
  2. ct/2
  3. ct-2
  4. ct-1

Answer: ct/2

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