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= -1/12
-f=-12 f=12
R = 2f = 2.12 = 24
S'nya negatif karena bayangan dibelakang cermin
1/12 + 1/6 = 1/f
3/12 = 1/f
f = 12/3
= 4 cm
f = R/2
4 = R/2
R = 4 x 2 = 8 cm
*catatan :
s : jarak benda ke cermin
s aksen : jarak bayangan
f : jarak fokus
R : jari jari