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Chapter 6(1).notebook
1
April 10, 2014
Chapter 6(1).notebook
2
April 10, 2014
The type of lens needed to correct a vision problem depends on whether the convex, human eye lens converges the light rays to a point in front of or behind the retina.
Chapter 6(1).notebook
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April 10, 2014
Normal Vision
When light rays from a distant object enter the eye, the rays are parallel.
The lens, which is convex, causes the rays to converge at the retina, producing a sharpe image.
Chapter 6(1).notebook
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April 10, 2014
Nearsightedness (myopia)
nearby objects are seen clearly
distant objects are hard to bring into focus
the eye lens refracts the light too much
light rays converge in front of retina
corrected with a concave lens
Chapter 6(1).notebook
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April 10, 2014
Farsightedness (hyperopia)
distant objects are seen clearly
nearby objects are hard to bring into focus
the eye lens does not refract the light enough
light rays converge behind the retina
corrected with a convex lens
Chapter 6(1).notebook
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April 10, 2014
Bill Nye Eyeball
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