| 21. | Transparency depends upon the linearity of the passage of light rays through the material.
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| 22. | Now we look at light rays that are directed outward, along these normal vectors.
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| 23. | Even in the drizzle, the mast of the solar tent registered a few light rays.
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| 24. | It possesses a light ray system that extends for a distance of over 400 kilometers.
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| 25. | A custom-tailoring service uses light rays rather than a measuring tape to size up customers.
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| 26. | The same laws of reflection and refraction hold for sound rays as for light rays.
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| 27. | These behaved similarly to visible violet light rays, but were beyond them in the spectrum.
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| 28. | His analyses of reflection and refraction considered the vertical and horizontal components of light rays separately.
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| 29. | A laser light source provides a light ray.
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| 30. | This conic section is the intersection of the cone of light rays with the flat surface.
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