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2. Coupon - Wikipedia

   en.wikipedia.org/wiki/Coupon

   Food stuff ration coupons types I–V for direct laborers and workers in Vietnam, 1976–1986. In marketing, a coupon is a ticket or document that can be redeemed for a financial discount or rebate when purchasing a product.

3. Ray (optics) - Wikipedia

   en.wikipedia.org/wiki/Ray_(optics)

   The principal ray or chief ray (sometimes known as the b ray) in an optical system is the meridional ray that starts at an edge of an object and passes through the center of the aperture stop. [ 5 ] [ 8 ] [ 7 ] The distance between the chief ray (or an extension of it for a virtual image) and the optical axis at an image location defines the ...

4. Ray transfer matrix analysis - Wikipedia

   en.wikipedia.org/wiki/Ray_transfer_matrix_analysis

   Each optical element (surface, interface, mirror, or beam travel) is described by a 2 × 2 ray transfer matrix which operates on a vector describing an incoming light ray to calculate the outgoing ray. Multiplication of the successive matrices thus yields a concise ray transfer matrix describing the entire optical system.

5. Smartglasses - Wikipedia

   en.wikipedia.org/wiki/Smartglasses

   The lenses of smart sunglasses can be manufactured out of multiple adaptive cells, therefore different parts of the lens can exhibit different optical properties. For example, the top of the lens can be electronically configured to have different polarization filter characteristics and different opacity than the lower part of the lens. [42]

6. AC Lens - Wikipedia

   en.wikipedia.org/wiki/AC_Lens

   AC Lens incorporated in the State of Ohio in 1998. In 2000, AC Lens acquired I-Ohio LLC in an exchange of private stock. [2] AC Lens now operates various websites including USA and United Kingdom based sites. Dr. Clarkson is a graduate of Southampton University in the UK and the Ohio State University College of Medicine.

7. Discounts and allowances - Wikipedia

   en.wikipedia.org/wiki/Discounts_and_allowances

   Discounts and allowances are reductions to a basic price of goods or services.. They can occur anywhere in the distribution channel, modifying either the manufacturer's list price (determined by the manufacturer and often printed on the package), the retail price (set by the retailer and often attached to the product with a sticker), or the list price (which is quoted to a potential buyer ...