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f=15cm
so=20cm
1/si=1/15-1/20
=4-3/60
=1/60
si=60
perbesaran bayangan = 60-20=40
note: ho=tinggi objek
f=fokus
so=jarak objek
si=jarak bayangan
ga tau kalo salah ;_;
1/15 = 1/20 + 1/s'
1/15 - 1/20 = 1/s'
1,3/20- 1/20 = 1/s'
0,3 /20 = 1/s'
0,3s'= 15
s'= 50
M = 50 / 20
= 2,5