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1/15 + 1/30
2/30 + 1/30
1/ f = 3/30
f =30/3
f =10 cm
jika so mendekati cermin cekung sebesar 3 cm maka
1/ f = 1/ so + 1/ si
1/si = 1/ f - 1/ so
1/10 - 1/12
6/60 - 5/60
1/ si = 1 / 60
si = 60 cm (D)
ket: so = jarak benda dengan cermin
s' = jarak bayangan
jadikan jawaban ter brainly