Question

Benda yang tingginya 10cm diletakan di depan cermin cekung, titik focus 15cm. Jika jaraknya 20cm, tentukan jarak dan perbesaran bayangan

Answer 1

1/f =1/so + 1/si
1/15 = 1/20 + 1/si
1/15 - 1/20 = 1/si
4/60 - 3/60 = 1/si
1/60  = 1/si
si = 60 cm
Jarak bayangan = 60 cm didepan cermin

M= si/so
=60/20
= 3 kali
Perbesaran = 3 kali

Semoga Bermanfaat :)

Answer 2

S' =
=
=
= 60 cm

m =
=
= 3 kali