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.
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Additional information and assistance can be found at the Medicare.gov website or under the âRelated Links Inside CMSâ section found below. Contact Information for People with Medicare. 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.