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Si = -5 cm
a) fokus
f = R/2
f = -20/2 = -10 cm
b) jarak benda
So = (Si * f) / (Si - f)
So = (-5 * -10) / (-5 + 10) = 10 cm
c) perbesaran
M = |Si| / So
M = |-5| / 10 = 1/2 = 0,5 kali