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a) s = 4 cm
s' = (s*f)/(s-f)
s' = (4*8)/(4-8) = -8 cm
M = s'/s
M = 8/4 = 2 kali
Sifat: maya, tegak, di depan lensa, diperbesar
b) s = ∞
s' = f = 8 cm
M = s'/s
M = 8/∞ = 0
Sifat: nyata, terbalik, di belakang lensa