O-LevelBiologyCoordination & Response5090/22 · Oct/Nov 2016 · Q610 Marks
As a person gets older, the lens of the eye loses its elasticity.
- (a)Describe and explain how light rays from a near object pass through the eye but may not form a sharply focused image for an older person.[7]
- (b)Suggest how reading glasses may bring the image into focus.[3]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2016). The mark or mark type is shown in brackets.
- [7] light/rays + bent/refracted/converged;
- following points must be related to, or imply, the idea of light/rays (accept image) passing through:
- cornea;
- pupil;
- aqueous/vitreous humour/bodies ;
- lens;
- (lens has) less ability to change shape AW/accommodate ;
- (therefore lens unable to bulge) fully/enough;
- (lens) cannot refract sufficiently/decrease focal length sufficiently AW ;
- (cannot focus on the) retina/fovea/yellow spot ;
- [3] convex (reference to spectacle lens) AW;
- (light/rays) bend/refract/converge ;
- before entering eye/(eye) lens ;
- compensate for thinness/lack of convexity or fatness in eye lens;
- (to focus on the) retina/fovea/yellow spot;
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