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JAMB Physics 1995 Question 35

Question 35

Light and Reflection

A real object is placed at a distance u cm in front of a curved mirror of focal length f cm. If the image is upright and magnified, then the mirror is

  1. A.convex and u = 2f
  2. B.concave and u = 2f
  3. C.convex and u = f/2
  4. D.concave and u = f/2
Show the answer and explanation

Answer: D (concave and u = f/2)

Explanation

A convex mirror always gives a diminished image. A concave mirror gives an upright, magnified (virtual) image only when the object is inside the focal length, e.g. u = f/2.