NO 1 Dan 1 pakai cara DIK DIT JWB

OPTIK GEOMETRI

cermin cekung
f = 8 cm
s' = 12 cm (nyata di R2)
s = __? ← di R3

1/s + 1/s' = 1/f
1/s = 1/f - 1/s'
1/s = 1/8 - 1/12
1/s = 3/24 ,- 2/24
1/s = 1/24
s = 24 cm ,← jwb