Find the condition for the line lx+my+...

Find the condition for the line
lx+my+n=0 to be a normal to the ellipse `x^2/a^2+y^2/b^2=1`

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The correct Answer is:

`a^2/l^2+b^2/m^2=(a^2+b^2)^2/n^2` is the required condition.

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