Jawabanmu

2014-05-08T13:50:00+07:00
1/f = 1/s + 1/s'
1/7,5 = 1/15 + 1/s'
2/15 - 1/15 = 1/s'
1/15 = s'

   = s'/s
   =15 / 15
   = 1
perbesaran = 1

H = 3.1
   = 3 <<<<<

2014-05-08T13:55:27+07:00
Dik:Ho= 3cm, So=15 cm, F= 7,5 cm
Dit: H'
Jb: 1/s'= - 1/f - 1/So
     1/s'= - 1/7,5 - 1/15
1/s'= - 2/15 - 1/15
1/s'= |3/15|
s'= 15/3
s'= 5

H'= s'/so x Ho
H' = 5/15 x 3
H' = 1 cm
ket: s'= jarak bayangan, so= jarak benda, f= titik api, Ho= tinggi benda, Hi= tinggi bayangan