Question

Berapa jarak benda bila jarak bayangan benda 6 cm di depan cermin cembung dan titik fokus 2 cm?

Answer 1

Si = jarak bayangan
so = jarak benda
f = titik fokus

1/f = 1/si + 1/so
1/2 = 1/6 + 1/so
1/2 - 1/6 = 1/so
2/6 = 1/so
so = 6/2
so = 3 cm