In optics, refraction occurs when waves travel from a medium with a given refractive index to a medium with another at an angle. At the boundary between the media, the wave's phase velocity is altered, usually causing a change in direction.Its wavelength increases or decreases but its frequency remains constant.y measuring the angle of incidence and angle of refraction of the light beam, the refractive index n can be determined. Refractive index of materials varies with the frequency of radiated light. This results in a slightly different refractive index for each color.
If you suspect Medicare fraud please report it by phone at 1-800-447-8477 (1-800-HHSTIPS), or E-Mail at HHSTips@oig.hhs.gov. To report Medicaid fraud in North Carolina, call the North Carolina Medicaid Investigations Division at 919-881-2320.
Telephone numbers and web link information related to specific Medicare questions. 1  Medicare Service Center: 800-MEDICARE (800-633-4227) 2  Medicare Service Center TTY: 877-486-2048. 3  Report Medicare Fraud & Abuse: 800-HHS-TIPS (1-800-447-8477)  See Related Links Inside CMS below.