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panjang teropong = fokus objektif + fokus okuler
anggap objektif = x dan okuler = y
x + y = 160 cm x = 160 - y
x / y = 7
(160 - y) / y = 7
160 - y = 7y
160 = 8y
20 = y
Diketahui : M = 7 kali
L = 160 cm
Ditanya : ?
Jawab :
Cari dulu .
L =
lalu masukkan pada rumus .
M =
M =
M × = L -
7 = 160 -
7 + = 160
8 = 160
= 20 m
mohon maaf kalau salah ..