diket = so =20cm
f = 30cm
ditanya = si...?
dan M ...?
dijawab = 1/f = 1/si + 1/so
1/30 = 1/si + 1/20
1/30 - 1/20 = 1/si
2/60 - 3/60 = 1/si
-1/60 = 1/si
-60 = si
M = si/so
M = -60/20
M = -3
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diket = so =20cm
f = 30cm
ditanya = si...?
dan M ...?
dijawab = 1/f = 1/si + 1/so
1/30 = 1/si + 1/20
1/30 - 1/20 = 1/si
2/60 - 3/60 = 1/si
-1/60 = 1/si
-60 = si
M = si/so
M = -60/20
M = -3