AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
C — Cornea
The cornea is responsible for most of the refraction of incoming light. The eye lens only provides finer adjustment of focal length.
Source: Chapter 10, Section 10.1 – The Human Eye
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The textbook explicitly states: "Most of the refraction for the light rays entering the eye occurs at the outer surface of the cornea." The eye lens only fine-tunes focus. Students often incorrectly choose "Eye lens" — remember, the lens handles accommodation, not the bulk of refraction. Cornea is the correct answer.