Diverging Lens Behavior for Parallel Rays Steps:

• Parallel rays incident on a diverging lens refract outward after passing through.
• Backward extensions of these refracted rays intersect at the focal point F on the incident side.
• The lens formula $\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$ with $u = -\infty$ gives $v = f$ (virtual focus).
• Correct diagram shows diverging rays with extensions converging to F left of lens.

Why C is correct:

• Diagram C depicts parallel rays diverging post-lens, with extensions meeting at F on the object side, matching ray optics rule for diverging lenses.

Why the others are wrong:

• A: Shows rays converging to a real focal point, characteristic of converging lenses.
• B: Rays remain parallel after lens, ignoring divergence.
• D: Extensions meet at F on the image side, violating virtual focus location.

Final answer: C