CBSE Class 11-science Answered

If distance between focus and directrix is 2a , then equation of parabola is  y² = 4 a x

Hence for a given x-coordinate , y-coordinate of points on parabola are

For various value of x , we calculte the y-coordinate , mark these points (x,y)  on x-y plot , then join these points by smooth curve.

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For example , let given distance between focus and directrix is 2 .

Hence , 2a = 2  and   a = 1 .

Hence the parabola is y² = 4x

Following tables gives the x and y coordinates of different points on parabola

Above points are plotted on x-y plot given below and joined by smooth curve to get the parabola y² = 4x