Jawabanmu

2014-05-12T18:29:39+07:00
1) f= 1/2 jari-jari = 1/2 x 40 =20 cm

1/jarak bayangan = 1/f - 1/jarak benda
1/jarak bayangan = 1/20 - 1/10
1/jarak bayangan = - 1/20
jarak bayangan = -20 cm

2) Perbesaran bayangan = Jarak bayangan : Jarak benda
= -20 : 10
= -2 kali

Perbesaran = Tinggi bayangan : tinggi benda
-2 = Tinggi bayangan : 5
Tinggi bayangan = -2 x 5 = -10 cm