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1)1/f=1/v-1/u
=1/25-1/-100
=4+1/100
=5/100
=20
2)1/f=1/30-1/-60
=2+1/60
=3/60
=20
3)1/f=1/40-1/-40
=1+1/40
=2/40
=20
4)1/f=1/60-1/-30
=1+2/60
=3/60
=20
5)1/f=1/100-1/-25
=1+4/100
=5/100
=20
6)1/f=1/120-1/-15
=15+120/1800
=135/1800
=0.075
please put my answer as brainliest
=1/25-1/-100
=4+1/100
=5/100
=20
2)1/f=1/30-1/-60
=2+1/60
=3/60
=20
3)1/f=1/40-1/-40
=1+1/40
=2/40
=20
4)1/f=1/60-1/-30
=1+2/60
=3/60
=20
5)1/f=1/100-1/-25
=1+4/100
=5/100
=20
6)1/f=1/120-1/-15
=15+120/1800
=135/1800
=0.075
please put my answer as brainliest
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