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f = 10cm
h = 4cm
ditanya h'.....?
1/s' = 1/f - 1/s
1/s' = 1/10 - 1/5
1/s' = 1/10 - 2/10
1/s' = -1/10
s' = -10
s'/s = h'/h
10/5 = h'/4
h' = 10 x 5 / 4
h' = 8cm