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A thin lens is placed 50cm from an illustrated ... - WAEC Physics 2009 Question

A thin lens is placed 50cm from an illustrated object. The image produced has linear magnification of 14. Calculate the power of the lens in dioptres
A
2.5D
B
5.0D
C
10.0D
D
25.0D
correct option: c
1v=1u

m = vu=14=v50

v = 12.5

But 1v+iu=1f

= 150+112.5=f

f = 10m

P = 10010=10D
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