Question

Tolong jwb pakai cara.. yg jwb benar makasih

Answer 1

1/2 jari2 cermin cekung = jarak fokus
jarak fokus 1/12 +1/4 = 1/12+3/12
                               = 4/12
                                = 3
1/2 jari2 cermin cekung = 3
jari2 cermin cekung = 6

jadi B :)

Answer 2

Diketahui = S₀ = 12 cm
                  S₁ = 4 cm
Ditanya = R..?
Jwab
1/f = 1/S₀ + 1/S₁
1/f = 1/12 + 1/4
1/f = 1+3/12
1/f = 4/12
   f = 3 cm

R = 2f
R = 2 x 3
R = 6 cm

Jawbannya B