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So = 6 cm
f = 4 cm
Dit : Si .... ?
Jawab:
1/Si = 1/f - 1/So
1/Si = 1/4 - 1/6
1/Si = 3/12 - 2/12
1/Si = 1/12
Si = 12 cm (B)
h = 2 cm
f = 4 cm
Dit: s' = ?
Jwb:
1 = 1 + 1
f s s'
1 = 1 - 1
s' f s
= 1 - 1
4 6
= 3 - 2
12
= 1
12
maka s' = 12 = 12 (b)
1