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1/8 = 1/4 + 1/s'
1/s' = 1/8 - 1/4
1/s' = -1/8
s' = -8 (Insyaalloh)
f= 8 cm
s'= . . . ?
1/f = 1/s + 1/s'
1/s' = 1/f - 1/s
= 1/8 - 1/4
= (1 - 2) /8
1/s' = -1/8
s' = -8 cm