Panjang teropong (d) = foby + foku
10 = foby + foku
foby = 10 - foku
Perbesaran teropong (M) = foby/foku
3 = (10 – foku)/foku
3 foku + foku = 10
4 foku = 10
foku = 2,5 cm
maka : foby = 10 – foku = 10 – 2,5 = 7,5 cm
Jawaban : B
Panjang teropong (d) = foby + foku
10 = foby + foku
foby = 10 - foku
Perbesaran teropong (M) = foby/foku
3 = (10 – foku)/foku
3 foku + foku = 10
4 foku = 10
foku = 2,5 cm
maka : foby = 10 – foku = 10 – 2,5 = 7,5 cm
Jawaban : B
Editor: Ali A
Sumber: Kumpulan Soal OSN IPA SMP