refracting surface
51Lens — The transparent structure inside the eye that focuses light rays onto the retina (the nerve layer that lines the back of the eye, senses light and creates impulses that go through the optic nerve to the brain). The lens was named after the lentil …
52Snell's law — In optics and physics, Snell s law (also known as Descartes law, the Snell–Descartes law, and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other… …
53Télescope — Pour les articles homonymes, voir Télescope (homonymie). Un télescope, (du grec τηλε (tele) signifiant « loin » et σκοπεῖν (skopein) signifiant « regarder, voir »), est un instrument d optique permettant d augmenter la… …
54Europa (moon) — Europa Europa s trailing hemisphere in approximate natural color. The prominent crater in the lower right is Pwyll and the darker regions are areas where Europa s primarily water ice surface has a higher mineral content. Imaged on September 7,… …
55Moons of Saturn — Artist s concepts of the Saturnian ring–moon system Saturn, its rings and major icy moons from Mimas to Rhea …
56Rings of Saturn — The full set of main rings, imaged as Saturn eclipsed the Sun from the vantage of the Cassini spacecraft on 15 September 2006 (brightness is exaggerated). The pale blue dot at the 10 o clock position, outside the main rings and just inside the G… …
57History of optics — Optics began with the development of lenses by the ancient Egyptians and Mesopotamians, followed by theories on light and vision developed by ancient Greek and Indian philosophers, and the development of geometrical optics in the Greco Roman… …
58eye, human — ▪ anatomy Introduction specialized sense organ capable of receiving visual images, which are then carried to the brain. Anatomy of the visual apparatus Structures auxiliary to the eye The orbit The eye is protected from mechanical injury… …
59industrial glass — Introduction solid material that is normally lustrous and transparent in appearance and that shows great durability under exposure to the natural elements. These three properties lustre, transparency, and durability make glass a favoured… …
60Drop (liquid) — For other uses of raindrop , see Raindrops (disambiguation). Droplet redirects here. For the type of applet in AppleScript which accepts files dropped onto it, see AppleScript#Applets and Droplets. Water drops falling from a tap. A drop or… …
