lensa cembung (+)
jari-jari 24 cm
maka f = 12 cm
1/f = 1/s + 1/s'
1/12 = 1/6 + 1/s'
1/s' = 1/6 - 1/12
1/s' = 2/12 - 1/12
1/s' = 1/12
s' = 12 cm
12 cm di belakang lensa
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lensa cembung (+)
jari-jari 24 cm
maka f = 12 cm
1/f = 1/s + 1/s'
1/12 = 1/6 + 1/s'
1/s' = 1/6 - 1/12
1/s' = 2/12 - 1/12
1/s' = 1/12
s' = 12 cm
12 cm di belakang lensa