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s = 10cm
f = -4cm
Dit s'......?
1/s' = 1/f - 1/s
1/s' = -1/4 - 1/10
1/s' = -10/40 - 4/40
1/s' = -14/40
s' = -40/14
s' = -2,85
jarak bayangan 2,85cm dibelakang lensa.