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M= 4 kali
rumus perbesaran
M = s' / s
4 =s' / 12
s' = 48 cm
s' = -48cm(negatif karena maya(
habis itu cari jarak fokusnya
1/f = 1/s + 1/s'
1/f = 1/12 +(- 1/48)
1/f = 4/48 - 1/48
1/f = 3/48
f= 16 cm
untuk mengetahui kekuatan lensa, masukin rumus
P = 100/f
= 100/16
= 6,25 dioptri
kira kira begitu..
maaf klo salah.
semoga bermanfaat