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July 29, 2014

July 29, 2014

Posted by **Andrew** on Monday, May 28, 2012 at 4:28pm.

- Physics -
**drwls**, Monday, May 28, 2012 at 5:43pm1/do + 1/di = 1/f

di/do = 6

di + do = 33

You have to solve three equations in three unknowns. Solve the last two in two unknowns first.

do + 6do = 33

do = 33/7 = 4.714 cm,

di = 28.286 cm

Now solve for f using the first equation.

f = 4.0406 cm

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