Jawabanmu

2014-02-22T16:49:13+07:00
Jarak bayangan(Si) : 12 cm
perbesaran bayangan(M): 0,4
tinggi bayangan(hi): 2 cm
2014-02-22T17:01:52+07:00
Dik :
si = Jarak bayangan
so = jarak benda
hi = tinggi bayangan
ho = tinggi benda

jarak bayangan =
1/F = 1/so + 1/si
1/20 = 1/30 + 1/si
1/si = 1/20 - 1/30
1/si = 1/60
si = 60/1 = 60 cm

M(Perbesaran) = si/so
= 60/30
= 2 kali perbesaran

tinggi bayangan =
hi/ho = si/so
hi/5 = 60/30
= 300/30
= 10 cm