Which statement is true about the index of refraction among crown glass, CR-39, Polycarbonate, and Trivex?

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Prepare for the NBEO Physiological Optics Test with flashcards and multiple choice questions, each offering hints and explanations. Equip yourself for your exam!

Multiple Choice

Which statement is true about the index of refraction among crown glass, CR-39, Polycarbonate, and Trivex?

Explanation:
Light slowing and bending in a lens material is determined by its index of refraction. Among these common ophthalmic materials, CR-39 has the smallest index, about 1.498. Crown glass sits a bit higher (roughly 1.52), Trivex is around 1.532, and polycarbonate is the highest (about 1.586). So CR-39 truly has the lowest index, which is why that statement is the correct one.

Light slowing and bending in a lens material is determined by its index of refraction. Among these common ophthalmic materials, CR-39 has the smallest index, about 1.498. Crown glass sits a bit higher (roughly 1.52), Trivex is around 1.532, and polycarbonate is the highest (about 1.586). So CR-39 truly has the lowest index, which is why that statement is the correct one.

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