kak tolong bantu kerjakan besok dikumpulin no.14 kasih cara .makasih

1/f = 1/Si + 1/So
=>1/f = 1/24 + 1/8
=>1/f = 1/24 + 3/24
=>1/f = 4/24 = 1/6
=>f = 6 cm

jika So (8 cm) digeser 2 cm menjauhi cermin
=>8+2=10 cm, maka Si = ?

1/Si = 1/f - 1/So
=>1/Si = 1/6 - 1/10
=>1/Si = 5/30 - 3/30
=>1/Si = 2/30
=>1/Si = 1/15
=>Si = 15 cm

jadi, jawabannya B. 15 cm