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
Correct Answer: A. concave mirror of focal length 5cm
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