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karena
1/f = 1/s' + 1/s
1/4 = 1/12 + 1/x
1/4 - 1/12 = 1/x
3/12 - 1/12 = 1/x
2/12 = 1/x
12/2 = x
6 = x (jarak benda dari cermin / s)
M = s'/s
M = 12/6
M = 2x
Jadi perbesarannya 2x.. sekian semoga membatu
f = 4 cm
s' = 12 cm
dit
M = perbesaran bayangan
jawab...
1/f = 1/s' + 1/s
1/4 = 1/12 + 1/s
1/4 - 1/12 = 1/s
3/12 - 1/12 = 1/s
2/12 = 1/s
s = 12 / 2
s = 6
M = I s'/s I
M = I 12/6 I
M = 12/6
M = 2 kali....
semoga membantu...sob....