| 21. | Chromatic aberrations are caused by lens's refractive index with wavelength.
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| 22. | D usually denotes the refractive index at the nm wavelength.
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| 23. | Refractive index is used to measure solids, liquids, and gases.
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| 24. | A refractometer is the instrument used to measure refractive index.
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| 25. | Where is the refractive index along the central axis of the fiber.
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| 26. | The refractive indices are subject to spatial and temporal changes.
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| 27. | Its refractive indices are 2.350 and 2.416 respectively.
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| 28. | The refractive index of jet is approximately 1.66.
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| 29. | Refractive error can be estimated via photography, a technique called photoscreening.
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| 30. | Persons who are thinking about refractive surgery should consider this.
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