The length of the subnormal is always constant and is equal to the semi-latus rectum i.e. 2a …Hence D is the correct. This discussion on The length of the sub normal to the parabola y2=4ax at any point is equal toa)√2ab)2√2ac)a/√2d)2aCorrect answer is option ‘D’.

## Answers ( )

Answer: 2a

which is constant.

Step-by-step explanation:y2=4ax at any point is equal toa)√2ab)2√2ac)a/√2d)2a

Step-by-step explanation:The length of the subnormal is always constant and is equal to the semi-latus rectum i.e. 2a …Hence D is the correct. This discussion on The length of the sub normal to the parabola y2=4ax at any point is equal toa)√2ab)2√2ac)a/√2d)2aCorrect answer is option ‘D’.