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+ =
+ =
=
6f = 30
f =
f = 5 cm
Jadi, jarak fokusnya adalah 5 cm
1/f=1/6+1/30
1/f=5+1/30 (disamakan penyebutnya)
1/f=6/30
f =30/6 (keduanya dibalik)
f =5
jadi, jarak fokus adalah 5 cm