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= 1/3 kali perbesaran
M = s'/s
1/3 = s'/15
1/3 . 15 = s'
s' = 5 cm
1/f = 1/s + 1/s'
1/f = 1/15 + 1/5
1/f = 1/15 + 3/15
1/f = 4/15
f = 15/4
= 3 3/4 cm