AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The crystalline lens provides finer adjustment of focal length to focus objects at different distances clearly on the retina.
Source: Chapter 10, Section 10.1 – The Human Eye
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The key phrase from the textbook is "finer adjustment of focal length" — examiners expect this exact idea. Note that most refraction occurs at the cornea; the lens only fine-tunes focus. Avoid writing that the lens "does all the refraction," as that contradicts the source.