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s=30cm
P=5dioptri
Ditanya: s'=.....?
f=1/p
=1/5=0, 2cm
1/s'=1/f - 1/s
1/s'=1/0, 2 - 1/30
1/s'=150/30 - 1/30
1/s'=149/30
s'=30/149=0,201 cm