u=30,f=?,v=?,ho =1,m=2,hi=?
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heyy mate..
here is ur answer:-
m=hi/ho
=>2=hi/1
=>hi=2
Now,we know m=-v/u
=>2=-v/30
=>v=-60
Now,by mirror formula,
1/f= 1/v-1/u
1/f=-1/60-1/30
1/f=-3/60
1/f= -1/20
So,f=-20
hope it helps...❤..
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