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1/f=1/s+1/s'
pertama kita cari dulu jarak bayangan, jadi
1/s'=1/f-1/s
=1/10-1/15
samain penyebut
=3/30-2/30
=1/30
jadi s'=30
cara nyari perbesaran: M= s'/s= 30/15= 2
1/s' = -15/150 - 10/150
1/s' = -25/150
150=-25s'
s'=-6
perbesaran bayangan
m=s'/s
m=-6/15
bayangan yg terbentuk diperkecil, nyata, tegak