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Posted by **emi** on Sunday, December 9, 2012 at 10:01am.

IMAGE 2.5 TIMES MAGNIFIED AT A DISTANCE OF 25CM FROM THE LENS.CALCULATE THE FOCAL LENGTH OF THE LENS,

- physics -
**Elena**, Sunday, December 9, 2012 at 10:44am2.5x/25 = x/do

do=25x/2.5x=10cm

1/di+1/do=1/f

1/25 + 1/10 =1/f

7/50=1/f

f=50/7=7.14 cm

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