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A concave mirror has a radius of curvature of 36cm. At what distance from the...

Physics
JAMB 1992
A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?
  • A. 12cm
  • B. 24cm
  • C. 48cm
  • D. 108cm
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Correct Answer: Option B
Explanation
F = \(\frac{uv}{u + v}\)

v = 3u

18 = \(\frac{3u \times u}{3u + u}\)

u = 24cm
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