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12 Cards in this Set
- Front
- Back
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What is the part of the eye that contracts and dilates? Why does it do this?
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The pupil. It does this to control the amount of light that enters the eye.
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What opaque tissue surrounds the cornea?
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the sclera
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What are the two characteristics of a reflection from a convex mirror?
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they allow you to see a lot of your surroundings, and they appear smaller.
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On a concave lens, do rays converge or diverge?
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They diverge PHOOOOL!
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Which mirror makes rays converge?
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Concave mirror
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Which lens makes rays converge?
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Concave lens
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Which mirror makes rays diverge?
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Convex mirror
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what vision system can we see with the rod cells?
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we can see black and white, and in darkened areas and in low light conditions
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what is it called when parallel light rays meet at a single point?
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the focal point......FOOLIO!!
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describe the shape of someone's eye, if they are nearsighted
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the eye is too long, because the image falls short of the retina
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describe the shape of someone's eye, if they are farsighted
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the eye is too short, because the image light rays are too long and cannot converge fast enough to hit the retina
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what do contact lenses do?
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they squeeze the eye into shape
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