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1/15 = 1/20 + 1/s'
1/s' = 1/15 - 1/20
1/s' = 4/60 - 3/60
1/s' = 1/60
s' = 60 cm (jarak bayangan dari cermin)
M = s' / s
M = 60 / 20
M = 3 kali (perbesaran bayangan)