if v=30 and u=15 find focallength of the mirror
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v=30 and u=15
1/f=1/v+1/u
1/f=1/30 +1/15
1/f=3/30
f=10
1/f=1/v+1/u
1/f=1/30 +1/15
1/f=3/30
f=10
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