A thin lens is placed 50cm from an illustrated object. The image produced has a 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 Answer: Option C

C. 10.0D

Explanation

1/v=1/u

m = v/u=14=v/50

v = 12.5

But 1/v+1/u=1/f

= 1/50+1/12.5 = 1/f

f = 10m

P = 100/10=10D