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so=20cm
si=5cm
f=?
1/f=1/si+1/so
=1/5+1/20
=5/20
=1/4
f=4
s`=5cm
jb: 1/f = 1/s + 1/s`
1/f = 1/20 + 1/5
1/f = 1/20 + 4/20
1/f = 5/20
20 = 5f
f = 4 cm