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15. T is a point on the tangent to a parabola y²=4ax at its point P.TL and TN are the perpendiculars on the focal radius SP and the directrix of the parabola respectively.then- (A) SL = 2TN (B) 3SL = 2TN (C) SL = TN (D) 2SL = 3TN |
| Answer» 15. T is a point on the tangent to a parabola y²=4ax at its point P.TL and TN are the perpendiculars on the focal radius SP and the directrix of the parabola respectively.then- (A) SL = 2TN (B) 3SL = 2TN (C) SL = TN (D) 2SL = 3TN | |