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  1. An object placed at 20 cm in front of a concave mirror produces three times
  2. A satellite of mass m revolves around the earth of radius R at a height x from
  3. Which of the following phenomenon exhibited the particle nature of light?
  4. A man throws balls with the same speed vertically upwards one after the other
  5. The acceleration due to gravity near the surface of a planet of radius R and density d