Parallel rays through converging lens converge at focal point

Steps:

• Parallel beam means rays are incident parallel to the principal axis.
• Converging lens refracts these rays to converge at the focal point F on the opposite side.
• Focal point F is where image forms for object at infinity.
• Correct diagram shows post-lens rays meeting at F.

Why C is correct:

• Diagram C depicts parallel rays converging exactly at F, following the converging lens property that parallel incident rays focus at the focal point.

Why the others are wrong:

• A: Rays remain parallel after lens, ignoring refraction.
• B: Rays diverge after lens, characteristic of a diverging lens.
• D: Rays converge but not at F, violating focal point definition.

Final answer: C