A converging lens of focal length 5cm is used as a magnifying glass by a...
PHYSICS
WAEC 1998
A converging lens of focal length 5cm is used as a magnifying glass by a man whose nearpoint is 35cm. Calculate the magnification given by the lens
- A. 8
- B. 7
- C. 6
- D. 5
Correct Answer: C. 6
Explanation
\(\frac{1}{f} = \frac{1}{u} + \frac{1}{v}\)
= \(\frac{1}{5} - \frac{1}{35} = \frac{30}{175}\)
U = \(\frac{175}{30}\) = 5.8m
\(\frac{v}{u} = \frac{35}{5.8}\)
= 6
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