S = 12 cm
F = -6 cm (Lensa cekung fokusnya -)
A. S'
1/S' = 1/F - 1/S
1/S' = 1/-6 - 1/12 = -2 - 1/12
1/S' = -3/12
S' = -12/3
S' = -4 cm (Bayangan di depan lensa)
B. M
M = S'/S
M = |-4|/12
M = 1/3 kali atau 0,33 kali
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S = 12 cm
F = -6 cm (Lensa cekung fokusnya -)
A. S'
1/S' = 1/F - 1/S
1/S' = 1/-6 - 1/12 = -2 - 1/12
1/S' = -3/12
S' = -12/3
S' = -4 cm (Bayangan di depan lensa)
B. M
M = S'/S
M = |-4|/12
M = 1/3 kali atau 0,33 kali