Sebuah cermin cekung dengan jari jari 8 cm, benda terletak 6 cm dari depan cermin. tinggi benda 1 cm. tentukan : A. jarak bayangan B. perbesaran C. tinggi bayangan
liliput01
Diket: cermin cekung R = 8cm s = 6cm h = 1 cm Dit: a. s'...? b. M...? c. h...? jawab:
f = 1/2 R f = 1/2 x 8 = 4cm a. 1/s' = 1/f - 1/s 1/s' = 1/4 - 1/6 1/s' = 3/12 - 2/12 1/s' = 1/12 s' = 12 cm . b. M = s'/s M = 12/6 M = 2 kali . c. M = h'/h 2 = h'/1 h' = 2 x1 h' = 2cm
cermin cekung
R = 8cm
s = 6cm
h = 1 cm
Dit:
a. s'...?
b. M...?
c. h...?
jawab:
f = 1/2 R
f = 1/2 x 8 = 4cm
a.
1/s' = 1/f - 1/s
1/s' = 1/4 - 1/6
1/s' = 3/12 - 2/12
1/s' = 1/12
s' = 12 cm
.
b. M = s'/s
M = 12/6
M = 2 kali
.
c. M = h'/h
2 = h'/1
h' = 2 x1
h' = 2cm