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h = 1 cm
f = 3 cm
s = 6 cm
ditanyakan :
h' = ?
jawab :
1/f = 1/s + 1/s'
-1//3 = 1/6 + 1/s'
1/s' = -1/3 -1/6 = -2/6 - 1/6 = -3/6
s' = -2 cm
s'/s = h'/h
2/6 = h'/1
h' = 1/3 cm