passwella.
Menu

JAMB Physics 1990 Question 24

Question 24

Light and Reflection

An object which is 3 cm high is placed vertically 10 cm in front of a concave mirror. If this object produces an image 40 cm from the mirror, the height of the image is

  1. A.0.75 cm
  2. B.4.00 cm
  3. C.8.00 cm
  4. D.12.00 cm
Show the answer and explanation

Answer: D (12.00 cm)

Explanation

Magnification = v/u = 40/10 = 4, so the image is 4 × 3 = 12 cm high.