Question on: WAEC Physics - 2009
A thin lens is placed 50cm from an illustrated object. The image produced has linear magnification of (\frac{1}{4}). Calculate the power of the lens in dioptres
A
2.5D
B
5.0D
C
10.0D
D
25.0D
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Correct Option: C
(\frac{1}{v} = \frac{1}{u})
m = (\frac{v}{u} = \frac{1}{4} = \frac{v}{50})
v = 12.5
But (\frac{1}{v} + \frac{i}{u} = \frac{1}{f})
= (\frac{1}{50} + \frac{1}{12.5} = f)
f = 10m
P = (\frac{100}{10} = 10D)
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