Jawabanmu

2014-05-18T20:51:25+07:00
Cermin cembung fokus negatif :
1/So +1/Si=1/f
1/10 + 1/Si = -1/30
1/Si = -1/30 -1/10
1/Si = (-1-3)/30
1/Si = -4/30 
SI= 30/-4
Si = -7,5 cm

M= Si/So
=30/4 : 10
=30/4 x 1/10
=3/4 kali

Bay = diperkcil,maya,tegak