To produce a parallel beam of light from a concave mirror, the distance at a…

Physics JAMB 1994

To produce a parallel beam of light from a concave mirror, the distance at a which the lamp should be placed from the mirror is equal to

  • the focal length checkmark
  • two times the focal length
  • the distance of the image
  • two times the radius of curvature

The correct answer is: A

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