How to create perpendicular lines from points on a 3d curve?

I am new to GH. How to create lines that are perpendicular from points which lie on a 3d curve? I want the lines to point to the inside and projected on the surface. See attached.

Can you add the gh file?

And please be more clear about what you want. What is ‘inside’?

It appears to be a windshield surface, so Fabrizio would be referring to the lines pointing to the inside of the vehicle (smaller). The larger would be pointing tot he outside of the vehicle (larger).