Question

Sebuah benda berjarak 20cm di depan cermin cekung memiliki fokus 10cm.perbesaran bayangan yg dihasilkan adalah..

Answer 1

Dik : So = 20 cm
f = 10 cm
Dit : Perbesaran (M)?
Jawab :
-> 1/Si = 1/f - 1/So
 1/Si = 1/10 - 1/20
1/Si = 2-1/20
1/Si = 1/20
Si = 20/1 = 20 cm
~> M = Si/So
= 20/20 = 1 kali

Answer 2

Diketahui :
s= 20 cm
f =10 cm
ditanya :
M = ............ ?
jawab :
1/s + 1/s' = 1/f
1/ 20 cm + 1/s' = 1/10 cm
1/s' = 1/10 cm - 1/20 cm
1/s' = 2/20 cm - 1/20 cm
1/s' = 1/ 20 cm
s' = 20 cm
M = s' / s
M = 20 cm / 20 cm
M = 1
maaf jika salah dan semoga benar.