sebuah benda diletakan 15 cm di depan cermin cekung. jika jari jari cermin 10 cm, perbesaran benda adalah... kali

Diket :
R= 10 cm
R= 2f
Berarti f = 5

So= 15
Tentukan M

1/f - 1/so = 1/Si
1/5 - 1/15 = 1 / Si
3-1/15 = 1/Si
2/15 = 1/Si
7,5 = Si


M = |Si/So|
= |7,5/15|
=0,5 atau 1/2

Maaf kalo salah

So = 15cm
r = 10cm

f = ½.r
f= ½.10
f = 5 cm

1/f = 1/So + 1/Si
1/5 = 1/15 + 1/Si
1/Si= 1/5 - 1/15
1/Si = 3/15 - 1/15
1/Si = 2/15 <= kalikan silang
2Si = 15
Si = 7.5

M = |Si/So|
M = |7,5/15|
M= 0.5 atau ½