lens efficiency
41Headlamp — Headlight redirects here. For other uses, see Headlight (disambiguation). High Beams redirects here. For the urban legend also known by that name, see Killer in the backseat. A motor scooter s front with an impractical number and variety of… …
42football — /foot bawl /, n. 1. a game in which two opposing teams of 11 players each defend goals at opposite ends of a field having goal posts at each end, with points being scored chiefly by carrying the ball across the opponent s goal line and by place… …
43Antenna (radio) — Whip antenna on car …
44Science of photography — refers to the use of science, such as chemistry and physics, in all aspects of photography. This applies to the camera, its lenses, physical operation of the camera, electronic camera internals, and the process of developing film in order to take …
45Organic light-emitting diode — Demonstration of a flexible OLED device A green emitting OLED device An …
46Presbyopia — is a condition where the eye exhibits a progressively diminished ability to focus on near objects with age. Presbyopia’s exact mechanisms are not known with certainty; the research evidence most strongly supports a loss of elasticity of the… …
47Hydrogen economy — The hydrogen economy is a proposed system of delivering energy using hydrogen. The term hydrogen economy was coined by John Bockris during a talk he gave in 1970 at General Motors (GM) Technical Center.[1] Hydrogen advocates promote hydrogen as… …
48Stage lighting instrument — Stage lighting instruments are used in stage lighting to illuminate theatrical productions, rock concerts and other performances taking place in live performance venues. They are also used to light television studios and sound stages.Terminology… …
49Solar thermal energy — Solar thermal system for water heating in Santorini, Greece …
50Food miles — is a term which refers to the distance food is transported from the time of its production until it reaches the consumer. It is one dimension used in assessing the environmental impact of food. The concept of food miles originated in 1990 in the… …
