definitions for eye and lenses junior science
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Compound Lens | Combination of two or more lenses in contact with each other
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| Accommodation | Adjusting the focal length of a lens to focus near or distant objects clearly on the retina
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| Short-sightedness | When distant objects cannot be seen clearly
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| Long-sightedness | When near objects cannot be seen clearly
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| Myopia | When near and distant objects cannot be seen clearly, only middle objects can be seen clearly.
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| Pupil | a hole in the eye that allows light through
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| Lens | The part of the eye that refracts light from the object so the image forms on the retina
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| extraocular muscles | muscles around the eye ball that control eye movement
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| iris | the coloured ring of muscle that contracts to let less light in and relaxes to let more light in.
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| optic nerve | a bundle of nerves at the back of the retina that transmits the image to the brain
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| retina | a layer of cells at the back of the eye where the image forms
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| cones | receptors on the retina that detect colour
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| rods | receptors on the retina that detect light and dark/black and white
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| cornea | clear protective film covering outer eye which slightly refracts light.
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| sclera | whites of the eyeball
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| ciliary muscles | muscles that control the curvature of the lens and therefore its ability to focus the image on the retina
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| vitreous humour | colourless fluid in the middle of the eyeball that gives the eyeball its shape
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| convex lens | a lens that bulges outwards on both sides and is used to magnify objects eg magnifying glass.
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| concave lens | a lens that bulges inwards on both sides and is used to make objects appear smaller eg glasses for short sighted people.
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| prism | a triangular 3D object of glass or plastic that can refract and disperse light
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Created by:
simkar
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