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f itu fokus
s=jarak benda
s'=jarak bayangan
nah.....
kalo cermin cekung,lensa cembung=f bernilai positif
kalo cermin cembung.lensa cekung= f bernilai negatif
P=kuat lensa=1/f
oke jadiin aku sbg jawaban yg terbaik ya..... buat naik level thanks :D