At which of the following distances from the lens should a slide be placed on…

Physics WAEC 1991

At which of the following distances from the lens should a slide be placed on a slide projector if f is the focal length of the projector length?

  • less than f
  • greater than f but less than 3f
  • equal to f checkmark
  • equal to 2f
  • greater than 2f

The correct answer is: C

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