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 -
E.
4
Correct Answer: Option C
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