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

Physics
WAEC 2024

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

  • A. Concave mirror of focal length 5cm.
  • B. Concave mirror of focal length 10 cm.
  • C. Convex mirror of focal length 10 cm
  • D. Convex mirror of focal length 5cm
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Correct Answer: Option A
Explanation

Diameter = 20cm

The radius of curvature, R = 10cm

But, focal length, f = \(\frac{R}{2} = \frac{10}{2}\) = 5 cm.

Because the inside portion is polished, light reflects off the hollow, caved-in interior. A mirror that reflects light from its inner surface is concave.

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