Question

Suatu benda setinggi 15 cm diletakkan sejauh 30 cm dari cermin cekung. Jarak fokus nya 20 cm tinggi bayangan yg dihasilkan adalah?
A.15cm
B.30cm
C.45cm
D.60cm

Answer 1

1/si = 1/f – 1/s

1/si = 1/20 – 1/30

1/si = 3/60 – 2/60

1/si = 1/60

Si = 60

s/si = h/hi

30/60 = 15/x

½ = 15/x

30 = x