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s' = 1m = 100cm
P = 5 dioptri (positif = lensa cembung)
Dit: s....?
f = 1/P
f = 1/5
f = 0,2 m = 20cm
,
1/s = 1/f - 1/s'
1/s = 1/20 - 1/100
1/s = 5/100 - 1/100
1/s = 4/100
s = 25 cm
jadi jarak benda adalah 25cm = 0,25 m