What must be the distance between an object and a converging lens of focal length...
PHYSICS
JAMB 1990
What must be the distance between an object and a converging lens of focal length 20cm to produce an erect image two times the object height?
- A. 20cm
- B. 15cm
- C. 10cm
- D. 5cm
Correct Answer: C. 10cm
Explanation
F = \(\frac{uv}{u + v}\); v = 2u
20 = \(\frac{ux - 2u}{u + (-2u)}\); u = 10cm
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