Reflection of the line x+y+1=0 in the line lx+my+n=0 is

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(x+y+1)(l+m)−2l2+m2(lx+my+n)=0

(x+y+1)l2+m2−2(l+m)(lx+my+n)=0

(l+m+1)(x+y)−2(lx+my)l2+m2=0

none of these

answer is B.

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Detailed Solution

Required line is (x+y+1)+λ(lx+my+n)=0 such that lx+my+n=0is equally inclined to x+y+1=0 and this line.

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