Principal ray for the case of an actual physical object, Physics

Which of the subsequent is a principal ray for the case of an actual physical object and a convex (converging) lens? Indicate all that apply.

Ans:

In the thin lens approximation utilize to determine the nature orientation and position of the image formed by a lens there are 3 principle rays from any point on the object. For expediency we use an object which is an upright arrow perpendicular to the axis of the lens whose tail is on the principle axis of the lens and we chose the point from which the principle rays originate to be the head of the arrow.

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