Tolong ya……..mo di kumpul

1/s + 1/s' = 1/f
1/15 + 1/s' = 1/10
1/s' = 1/10 – 1/15
1/s' = 3/30 – 2/30
1/s' = 1/30
s' = 30 cm

M = | s'/s |
M = | 30/15 |
M = 2 kali

Jawaban: C