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f = 10cm
A.
1/f = 1/Sob + 1/S'ob
1/10 = 1/20 + 1/S'ob
1/S'ob = 2/20 - 1/20
S'ob = 20cm
B.
M = S'ob / Sob
= 20 cm / 20 cm
= 1x
C.
Sifat bayangan = nyata, terbalik, sama besar
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