70 Changes to ObamaCareâ¦ â So Far. By our count at the Galen Institute, more than 70 significant changes have been made to the Patient Protection and Affordable Care Act, at least 43 that the Obama administration has made unilaterally, 24 that Congress has passed and the president has signed, and three by the Supreme Court.
When a ray of light or a sound wave refracts or is refracted, the path it follows bends at a particular point, due to a change in the density of the substance it is passing th â¦ rough. For example if you put a pencil in a glass half full of water, the pencil looks like it is broken because the empty glass bends the light differently from the water.
Refraction (optics). Refraction is the phenomenon that causes a light ray to bend when it hits an optical lens surface (or other medium that can act to transmit light e.g. water). Refraction occurs when light strikes the surface of the new medium.As the light enters a dense medium is slows the light wave down.The light is passing from an optical medium (like air) to another optical medium (like glass).As the density of the medium changes the light striking the surface is refracted. The refraction is most obvious when when the light strikes the new medium at an angle.he light is passing from an optical medium (like air) to another optical medium (like glass). As the density of the medium changes the light striking the surface is refracted. The refraction is most obvious when when the light strikes the new medium at an angle.