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M = perbesaran
S' = jarak bayangan
S = jarak benda
f = titik fokus
M. = S' / S
1/3 = S'/S
1xS = 3 x 5 ( dikali silang)
S = 15 cm
1/f = 1/S + 1/S'
= 1/15 + 1/15
= 1/15 + 3/15
= 4/15
f = 15/4
=3,75 cm
semoga membantu dan semoga benar :)