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.
If you suspect someone of committing fraud, submit a report via our online fraud reporting form or contact us by mail, fax, or phone. U.S. Mail: Social Security Fraud Hotline P.O. Box 17785 Baltimore, Maryland 21235. FAX: 410-597-0118 Telephone: 1-800-269-0271 from 10 a.m. to 4 p.m. Eastern Standard Time TTY: 1-866-501-2101 for the deaf or hard of hearing.