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s' = 10 cm
f=10 cm
Dit: s' ?
jawab : 1/s' = -1/f - 1/s
= -1/10-1/5
1/s' = -3/10
s' = -10/3 =-3,334 cm
karena lensa cembung makanya rumus nya 1/s' = -1/f-1/s