tolong di jawabnyaa

perbesarannya 2 kali.

1/f = 1/So+1/Si
1/10 = 1/ 15 + 1/si
1/10 - 1/15 - 1/Si
3-2/30 = 1/Si
Si= 30

M = si/so mutlak
M = 30 / 15
M = 2 kali

maaf kalo salah '-')/