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1/f = 1/s +1/s'
1/15 = 1/20 + 1/s'
1/15 - 1/20 = 1/s'
(4-3)/60 = 1/s'
60 cm = s'
|s'/s| = |h'/h|
|60/20| = |h'/4|
3 . 4 = h'
12 cm = h'
2.
titik api = titik fokus
1/(-f) - 1/s = 1/s'
1/(-30) - 1/45 = 1/s'
(-3 -2)/90 = 1/s'
90/-5 = s'
-18 cm = s'
M = |s'/s|
M = |18/45|
M = 0,4 kali
M = |h'/h|
0,4 = |h'/5|
0,4 . 5 = h'
2 cm = h'