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.
Refracting telescopes are the most common form of the telescope - a long, thin tube where light passes in a straight line from the front objective lens directly to the eyepiece at the opposite end of the tube. Advantages: Easy to use and consistent due to the simplicity of design.