Eye Accommodation for Near Vision

Steps:

• The bus approaching requires focusing on a nearer object, triggering accommodation.
• Accommodation involves the ciliary muscle contracting to adjust lens shape.
• Contraction reduces tension on suspensory ligaments.
• Relaxed ligaments let the elastic lens become more rounded (convex) for near focus.

Why D is correct:

• In accommodation, ciliary muscle contraction decreases suspensory ligament tension, allowing the lens to round for diverging light rays from near objects, per the eye's focusing mechanism.

Why the others are wrong:

• A: Ciliary contraction decreases for distant vision, not near; lens flattens with more ligament tension.
• B: Less ciliary contraction increases ligament tension, preventing lens rounding.
• C: More ciliary contraction reduces ligament tension but lens becomes more rounded, not less.

Final answer: D