According to the imaging method, the lenses contain light rays whose path through a thin converging lens is known.

According to the imaging method, the lenses contain light rays whose path through a thin converging lens is known. These include the following rays:
a) falling on the lens parallel to the main optical axis;
b) passing through the optical center of the lens;
c) passing through the focus of the lens.
How do these rays pass after exiting the lens?

a) through the focus of the lens; b) without refraction; c) parallel to the main optical axis of the lens.