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2. Achromatic lens - Wikipedia

   en.wikipedia.org/wiki/Achromatic_lens

   The first-order design of an achromat involves choosing the overall power of the doublet and the two glasses to use. The choice of glass gives the mean refractive index, often written as n d {\displaystyle n_{d}} (for the refractive index at the Fraunhofer "d" spectral line wavelength ), and the Abbe number V {\displaystyle V} (for the ...

3. Optical filter - Wikipedia

   en.wikipedia.org/wiki/Optical_filter

   Optical filtering was first done with liquid-filled, glass-walled cells; [citation needed] they are still used for special purposes. The widest range of color-selection is now available as colored-film filters, originally made from animal gelatin but now usually a thermoplastic such as acetate, acrylic, polycarbonate, or polyester depending upon the application.

4. The Black Prism - Wikipedia

   en.wikipedia.org/wiki/The_Black_Prism

   The Black Prism is a fantasy novel by American author Brent Weeks. It is the first book in the five-volume [ 1 ] Lightbringer Series and follows Gavin Guile, known as the 'Prism' and the most powerful person in the world, [ 2 ] as he combats an uprising led by a self-proclaimed king.

5. Portal:Erotica and pornography - Wikipedia

   en.wikipedia.org/wiki/Portal:Erotica_and_pornography

   Jenna Haze (born 1982) is an American director, model, and former pornographic actress.. Haze has won numerous pornographic industry awards, including the 2003 AVN Award for Best New Starlet and the 2009 AVN Award for Female Performer of the Year, making her the second performer in history to ever win both awards in the course of her career, after Missy.

6. Prism cover test - Wikipedia

   en.wikipedia.org/wiki/Prism_Cover_Test

   The prism cover test (PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]

7. Pavement light - Wikipedia

   en.wikipedia.org/wiki/Pavement_light

   Pavement lights (UK), vault lights (US), floor lights, or sidewalk prisms are flat-topped walk-on skylights, usually set into pavement (sidewalks) ...