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
Correct Answer: B. 24cm
Explanation
F = \(\frac{uv}{u + v}\)
v = 3u
18 = \(\frac{3u \times u}{3u + u}\)
u = 24cm
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