Lenses with a higher refractive index are generally what in thickness compared with lower-index lenses?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

Lenses with a higher refractive index are generally what in thickness compared with lower-index lenses?

Explanation:
Higher refractive index means the lens bends light more strongly for each millimeter of material. Because the bending (focusing) power increases with n, you can achieve the same overall focal effect with less material. So, for the same prescription, a higher-index lens can be made thinner (and lighter) than a lower-index lens. The other options don’t fit because thickness isn’t fixed by the index in that way; higher index doesn’t force the lens to be thicker, and “the same” or “variable” thickness isn’t the general rule for this relationship.

Higher refractive index means the lens bends light more strongly for each millimeter of material. Because the bending (focusing) power increases with n, you can achieve the same overall focal effect with less material. So, for the same prescription, a higher-index lens can be made thinner (and lighter) than a lower-index lens. The other options don’t fit because thickness isn’t fixed by the index in that way; higher index doesn’t force the lens to be thicker, and “the same” or “variable” thickness isn’t the general rule for this relationship.

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