| 21. | Index of refraction is also composition-dependent and influences the extraction efficiency of photons from the material.
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| 22. | Reflection depends on differences in index of refraction.
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| 23. | Each ring has a different index of refraction.
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| 24. | DPS has a conventional positive index of refraction, while the DNG has a negative refractive index.
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| 25. | The first experimental confirmation of negative index of refraction occurred soon after, also at microwave frequencies.
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| 26. | An example of a plasma with an index of refraction less than unity is Earth's ionosphere.
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| 27. | So it is as if gravity increased the index of refraction of space near massive bodies.
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| 28. | Pure titanium dioxide has a very high index of refraction and an optical dispersion higher than diamond.
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| 29. | For X-rays a concave lens focuses the X-rays because the index of refraction is slightly below unity.
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| 30. | In wavelength ranges where a medium has significant absorption, the index of refraction can increase with wavelength.
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