Jawabanmu

2014-05-12T22:37:07+07:00
Cari dlu jarak bayangan
diket f = 1/2 R
f = 1/2 120
f = 60 cm
s = 180 cm
h = 30 cm
1/f = 1/s + 1/s'
1/60 = 1/180 + 1/s'
1/60 - 1/180 = 1/s'
3/180 - 1/180 = 1/s'
2/180 = 1/s'
180/2 = s'
90 cm = s'

s'/s = h'/h
90/180 = h'/30
1/2 = h'/30
1/2 x 30 = h'
15 cm = h' (tinggi bayangan)