1/15=1/30+1/s'
s'=30cm
S=30cm
f=15cm
S'=?
1 + 1 = 1
--- --- = ----
S S' f
1 1 1
---- + ----- = ------
30 S' 15
1 1 + 2
------ = ----------
S' 30
1 3
----- = -----
S'=30:3=10cm
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1/15=1/30+1/s'
s'=30cm
S=30cm
f=15cm
S'=?
1 + 1 = 1
--- --- = ----
S S' f
1 1 1
---- + ----- = ------
30 S' 15
1 1 + 2
------ = ----------
S' 30
1 3
----- = -----
S' 30
S'=30:3=10cm
Semoga membantu