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p = 200cm
s = 25 cm
s' = - p = - 200 cm
dit
P km
jawab
1/f = 1/s' + 1/s
1/f = - 1/200 + 1/25
1/f = - 1/200 + 8/200
1/ f = - 7/200
f = - 200/7
P km = 100/f
P km = 100
----------
- 200/7
P km = 1
--------- dioptri
2/7
klo pake kalkulator 3,5 dioptri..
semoga membantu....sob