# Calculating points on the curve

I want to get the x and y coordinates of a curve..How can i do that...

In the above image.Is it possible to calculate the intermediate points(one side) by knowing starting and ending point

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At least you have to have a model for the curve, and knowledge of extremities will let you pin down parameters of that model. Without the model, your question is incomplete. – Sasha Sep 8 '11 at 15:51
To add to Sasha: are you assuming it's a circle arc? A Bézier arc? What? – J. M. Sep 8 '11 at 15:56
I just point out the arc. I know starting point(i.e)top left and ending point (i.e)Bottom left. It is a bezier arc.. – Anish Sep 8 '11 at 16:04
Then your problem is underdetermined. Remember that a Bézier arc requires four control points to determine it. – J. M. Sep 8 '11 at 16:10
Ok...if it's is a parabolic arc...is is possible to find x and y coordinates.. – Anish Sep 8 '11 at 16:13

so then eccentricity of the lens is known or can be calculated,so one can find each corresponding $y$ for each $x$,