Edexcel GCSE Biology · 1BI0
Specification 2.15B · Paper 1
Revise: Structure and Function of the EyeThe cornea and lens focus the light, the iris controls how much enters, and rod and cone cells in the retina detect it.
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GCSE Biology · key term
A transparent, flexible structure that refracts light and changes shape to focus it on the retina.
Used by Edexcel and OCR
Specification 2.15B · Paper 1
Revise: Structure and Function of the EyeThe cornea and lens focus the light, the iris controls how much enters, and rod and cone cells in the retina detect it.
Specification B3.1d · Paper 1 (Foundation), Paper 3 (Higher)
The lens is a transparent, flexible structure behind the pupil. It refracts light further so that light from a point on an object is brought to a focus on the retina. A clear image is produced only when the light is focused on the retina rather than in front of or behind it.
In an explanation of focusing, name both refracting structures: the cornea bends incoming light and the lens changes shape to produce a sharp image on the retina.
For accommodation, give the complete sequence: ciliary muscles → suspensory ligaments → lens shape → amount of refraction.
Keep near and distant focusing distinct: a near object requires a thicker lens and greater refraction; a distant object requires a thinner lens and less refraction.
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Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The transparent structure behind the pupil that changes shape to help focus light on the retina.
Revise: The EyeThe cornea bends, or refracts, the light. It then passes through the pupil, an opening in the coloured iris, and through the transparent lens. The cornea and lens bring rays from each point on the object together on the retina at the back of the eye.