Can You Determine the Focal Length of a Concave Mirror?
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Questions and Answers

Where is the principal focus F located for a spherical mirror of small aperture?

  • At the pole P
  • At a distance equal to the focal length from the pole P
  • At the centre of curvature C
  • Mid-way between the pole P and the centre of curvature C (correct)

    • In the activity described in the text, what is the object used to obtain the image on the paper screen?

  • A lens
  • A burning candle (correct)
  • A concave mirror
  • A piece of paper

    • What should be done if an image is not obtained on the paper screen in the activity described in the text?

  • Increase the distance between the object and the mirror
  • Decrease the distance between the object and the mirror
  • Repeat the activity with a different object
  • Identify the position of the object and look for its virtual image in the mirror itself (correct)

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