toughest ophthalmic lens for industrial use is a) cr-39 b) crown glass c) polycarbonate d) transition
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Explanation:
Trivex is a lighter weight material, but due to its lower index of refraction more curvature and thickness is need to achieve a given power. Depending on the power and eye size, it will not always be the lightest lens. Impact Resistance Trivex claims to be as strong, or stronger than polycarbonate in impact resistance.
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Answer:
polycarbonate is the correct answer
Explanation:
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