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• teropong
pengamatan tidak berakomodasi
m = 6 kali
L = 35 cm
fok = __?
perbesaran
m = fob / fok
6 = fob / fok
fob = 6 fok
panjang tubus
L = fob + fok
35 = 6 fok + fok
35 = 7 fok
fok = 5 cm ← jwb
fob = 6 fok = 30 cm