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ABO NOCE Basic Opticianry

Category - Ophthalmic Optics

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Which of the following lenses has the lowest index of refraction?

Polycarbonate
Trivex
CR-39
Crown glass
Hi index 1.60

Explanation

Answer: C - CR-39 has the lowest index of reflection at 1.50.

This makes this lens less suitable for high-powered prescriptions than others listed.

Polycarb has an index of 1.59, Crown glass has an index of 1.52, Trivex has an index of 1.53 and hi index has an index of 1.6.

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