A converging lens of focal length 5cm forms a virtual image which is 10cm from...
PHYSICS
WAEC 1996
A converging lens of focal length 5cm forms a virtual image which is 10cm from the lens. How far from the lens is the object?
- A. 2.0cm
- B. 3.3cm
- C. 5.0cm
- D. 10.0cm
Correct Answer: B. 3.3cm
Explanation
\(f = \frac{uv}{u+v}\)
\(5 = \frac{-10u}{-10+u}\)
\(50 + 5u = -10u\)
\(50 = -10u - 5u\)
\(u = \frac{50}{-15}\)
u= -3.3cm
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