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1/f = 1/so +1/si (r=2f)
1/4 = 1/15 + 1/si
1/si = 1/4 - 1/15 i/si = 15/60 - 4/60 = 11/60 si = 5,45 cm
M = si/so = 5,45/15 = 0,363 kali mungkin
R=8cm
M=?
f=1/2 R
f=1/2 x 8 = 4cm
1/f=1/s + 1/s'
1/4=1/15+1/s'
1/s'=15/60 - 4/60
1/s'=11/60
s' = 60/11
M=s'/s
M=(60/11)/15
M=4/11