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The inside portion of part of a hollow metal sphere of diameter 20cm is polished....

Physics
JAMB 1999

The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a

  • A. concave mirror of focal length 5cm
  • B. concave mirror of focal length 10cm
  • C. convex mirror of focal length 5cm
  • D. convex mirror of focal length 20cm
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Correct Answer: Option A
Explanation

Since diameter of the sphere = 20cm, then, the radius of curvature = 10cm

Focal length, f = \(\frac{R}{2} = \frac{10}{2}\) = 5cm

The inside of a hollow metal sphere forms a concave mirror.

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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