Jawabanmu

2014-03-05T19:47:10+07:00
S' = -Pp
s' = -100

1/f = 1/s + 1/s'
1/f = 1/25 - 1/100
1/f = 4-1/100
f = 100/3 = 33,3 cm

P = 100/f = 100/33,3 = 3.003 dioptri

mohon dicek lagi,,maaf kalau salah