An object is placed in front of a converging lens of a focal length 20cm....
PHYSICS
JAMB 1994
An object is placed in front of a converging lens of a focal length 20cm. The image is virtual and has a magnification of 2. What is the distance of the object from the lens?
- A. 5cm
- B. 10cm
- C. 30cm
- D. 40cm
Correct Answer: B. 10cm
Explanation
V = -2u
F = \(\frac{uv}{u + v}\)
20 = \(\frac{uv - 2u}{u - 2u}\)
u = 10cm
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