Exp. (b)We have, e=21​ and ea​=4∴a=2 Now, ,b2=a2(1−e2)=(2)2[1−(21​)2]=4(1−41​)=3=3⇒b=3​ Equation of the ellipse is ∴(2)2x2​+(3​)2y2​=1Now, the equation of normal at ⇒4x2​+3y2​=1 is(1,23​)x1​a2x​−y1​b2y​=a2−b2⇒14x​−(3/2)3y​=4−3