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  1. Two lenses of power 15 D and -3 D are placed in contact.
  2. A heavy small sized sphere is suspended by a string of length l.The sphere rotates
  3. A wave travelling in the +ve x-direction having displacement along y-direction as 1m
  4. Charge passing through a conductor of cross-section area A=0.3 m² is given
  5. A body projected vertically from the earth reaches a height equal to earth’s radius