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Si=(So.f):(So-f)
=30.90:(30-90)
=2700:(-60)
=-45cm (kalau hasilnya - berarti sifat bayangan maya)
perbesaran bayangan
=Si:So
=45cm(negatifnya diabaikan):90cm
=1/2 kali
si = jarak bayangan
so = jarak benda
1/f = 1/si + 1/ so
1/90 = 1/si + 1/30
1/90-1/30 = 1/si
1/90- 3/90 = 1/si
-2/90 = 1/si
-90/2 = si
si = -30
m = perbesaran bayangan
m= si/so
m= 30/90
m= 1/3 kali