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Dik:so=15 cm
s'=30 cm
P=____?
penyelesaian:
1)cari fokus nya dulu
1/f=1/so+1/s'
1/f=1/15+1/30
1/f=2+1/30
1/f=3/30
1/f=30/3
1/f=10 cm
2)cari kuat lensa nya
P=100/f
P=100/10
P=10 Dioptri
jadi,kekuatan lensa tersebut adalah 10 Dioptri
semoga membantu:3
semangat ya belajar nya:3