Jawabanmu

2014-05-19T18:18:44+07:00
Cermin cekung = 1/s + 1/s' = 1/f dengan f = 1/2 R
cermin cembung = 1/s + 1/s' = 1/f dengan f = 1/2 R

archimedes = FA = Wu - Wa
2014-05-19T18:54:20+07:00
Cermin cekung: 1/S+1/S'= 1/f
cerimin cembung: 1/S+1S'= 2/R
archimedes: FA= Wu-Wa
mudah"n bermanfaat yya,, :)