| 11. | If it clouds or thickens, light rays are unable to pass through it.
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| 12. | It means that the light ray will emerge parallel to the incident ray.
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| 13. | While the sphere of light grows, the number of light rays stays the same.
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| 14. | The light rays are bent, refracted and focused by the cornea, lens, and vitreous.
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| 15. | We learn more from the light rays hitting our eyeballs than from anything else.
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| 16. | The sun, for instance, noticeably bends any light rays passing close by its surface.
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| 17. | The still apparently follows light rays, which seems natural enough.
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| 18. | Light rays are the boundary between the future, the spacelike, and the past regions.
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| 19. | In 1704 Isaac Newton suggested that a light ray could be deflected by gravity.
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| 20. | When the light ray strikes the lens from air, it is not normally incident.
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