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1/25 -1/100 =1/s'
4-1/100 = 1/s'
3/100 =1/s'
100/3 =s'
33,3 =s' (D)
diket:so=-100cm( karena lensa cekung)
f = 25 cm
ditanya: si ?
jawab: 1/si = 1/f - 1/so
1/si = 1/25 - 1/-100
1/si = -4 - 1/-100
1/si = 3/-100
si = -100/3
si = -33,3
semoga bermanfaat ya