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2. Abbe number - Wikipedia

   en.wikipedia.org/wiki/Abbe_number

   Values of range from below 25 for very dense flint glasses, around 34 for polycarbonate plastics, up to 65 for common crown glasses, and 75 to 85 for some fluorite and phosphate crown glasses. Most of the human eye's wavelength sensitivity curve, shown here, is bracketed by the Abbe number reference wavelengths of 486.1 nm (blue) and 656.3 nm (red)

3. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface of the eye.

4. High-refractive-index polymer - Wikipedia

   en.wikipedia.org/wiki/High-refractive-index_polymer

   A high-refractive-index polymer (HRIP) is a polymer that has a refractive index greater than 1.50. [1]Such materials are required for anti-reflective coating and photonic devices such as light emitting diodes (LEDs) and image sensors.

5. List of refractive indices - Wikipedia

   en.wikipedia.org/wiki/List_of_refractive_indices

   Some representative refractive indices; Name of material λ (nm) Refractive index no. n Reference Vacuum: 1 (by definition) Air at STP: 1.000273 [citation needed]Gases at 0 °C and 1 atm

6. Rihanna - Wikipedia

   en.wikipedia.org/wiki/Rihanna

   Robyn Rihanna Fenty (/ r i ˈ æ n ə / ⓘ ree-AN-ə; [3] [4] [n 1] born February 20, 1988) is a Barbadian singer, businesswoman and actress. She is the best-selling female recording artist of the 21st century by Guinness World Records and the highest-certified female digital single artist by RIAA.