1) The normal at the point (at21,2at1) on the parabola meets the parabola again in the point (at22,2at2) , then A) t2=−t1+2t1 B) t2=−t1−2t1 C) t2=t1−2t1 D) t2=t1+2t1 Answer: Option BExplanation: Equation of the normal at point (at21,2at1) on parabola is y=−t1x+2at1+at31 It also passes through (at22,2at2) So, 2at2=−t1(at22)+2at1+at31 ⇒2t2−2t1=−t1(t22−t21) ⇒t1+t2=−2t1 ⇒t2=−t1−2t1