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s = 40 cm
s' = - 40/3 cm
di tanya ;
P ..??
jawab
1/f = 1/s + 1/s'
1/f = 1/40 + 1/ -40 / 3
1/f = 1/40 - 3/40
1/f = - 2/40
= - 20 cm
P = 100 / f
= 100 / -20
= - 5