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JAMB Physics 1984 Question 6

Question 6

Light and Reflection

For a concave mirror to form a real diminished image, the object must be placed

  1. A.behind the mirror
  2. B.between the mirror and its focus
  3. C.between the focus and the centre of curvature
  4. D.at the centre of curvature
  5. E.at a distance greater than the radius of curvature.
Show the answer and explanation

Answer: E (at a distance greater than the radius of curvature.)

Explanation

A concave mirror gives a real, smaller image only when the object is beyond the centre of curvature.