Sebuah benda diletakkan 14 cm di depan cermin cembung yang mempunyai jari-jari kelengkungan 20 cm. Jika tinggi benda itu 5 cm, tentukan tinggi bayangan!
DwitasariP
Si = 14 cm R = 20 cm hi = 5 cm ho ? R = 2f 20 = 2f f = 20/2 = 10 cm 1/Si + 1/So = 1/f 1/14 + 1/So = 1/10 1/So = 1/10 - 1/14 1/So = 14-10 /140 1/So = 4/140 So = 140/40 = 3,5 cm ho/hi = So/Si ho/5 = 3,5/14 14ho = 3,5 × 5 ho = 17,5/14 = 1,25 cm bener nggk ?
R = 20 cm
hi = 5 cm
ho ?
R = 2f
20 = 2f
f = 20/2
= 10 cm
1/Si + 1/So = 1/f
1/14 + 1/So = 1/10
1/So = 1/10 - 1/14
1/So = 14-10 /140
1/So = 4/140
So = 140/40
= 3,5 cm
ho/hi = So/Si
ho/5 = 3,5/14
14ho = 3,5 × 5
ho = 17,5/14
= 1,25 cm
bener nggk ?