Physics - The eye 0.0 / 5 ? PhysicsThe EyeIGCSEAQA Created by: becky.65Created on: 02-04-16 12:43 Cornea Transparent layer that protects the eye and helps focus light onto the retina 1 of 13 Eye lens Focuses light onto the retina 2 of 13 Retina The light sensitive cells around the inside of the eye 3 of 13 Iris Coloured ring of muscle that controls the amount of light entering the eye 4 of 13 What does the iris control the size of? The pupil 5 of 13 Pupil the central hole formed by the iris. Light enters the eye through the pupil 6 of 13 Ciliary muscles The muscles that change the thickness of the eye lens 7 of 13 What are the ciliary muscles attached to the eye with? By suspensory ligaments 8 of 13 What happens when the ciliary muscles tighten? They become shorter, making the circumference of the lens shorter so the lens becomes thicker and more powerful 9 of 13 What happens when the ciliary muscles relax? They become longer, making the circumference of the lens longer so the lens becomes thinner and less powerful 10 of 13 When is the eye lens at its thickest and most powerful? When the eye is focused on a neardy object 11 of 13 When is the eye lens at its thinnest and least powerful? When the eye is focused on an object at infinity 12 of 13 Optic nerve Carries nerve impulses from the retina to the brain 13 of 13
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