Jawabanmu

Jawaban paling cerdas!
2014-01-23T19:33:42+07:00
Diketahui :
s' = -20 cm
f = 20 cm
ditanyakan : 
a. s
b. M
jawab :
a. 1/f = 1/s + 1/s'
1/20 = 1/s - 1/20
1/s = 1/20 + 1/20
s = 10 cm
b. M = |s'/s|
|-20/10|
2 kali
klau d blkng cermin jrk'a -20 ap 20 ajj?