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1/s + 1/s' = 1/f
1/0,5 + 1/s' = 1/0,4
1/s' = 1/0,4 - 1/0,5
1/s' = 5/2 - 4/2
1/s' = 1/2
s' = 2 m
Jika lensa cekung:
1/s + 1/s' = 1/f
1/0,5 + 1/s' = -1/0,4
1/s' = -1/0,4 - 1/0,5
1/s' = -5/2 - 4/2
1/s' = -9/2
-9s' = 2
s' = 2:(-9)
s' = -2/9 m