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M = f_ob/f_ok
f_ob = M (f_ok)
jarak kedua lensa:
L = f_ob + f_ok
L = M (f_ok) + f_ok
L = (M + 1) f_ok
80 = (20 + 1) f_ok
f_ok = 3.58 cm
f_ob = 71,6 cm <--
semoga membantu :)